https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&feed=atom&action=history273: Electromagnetic Spectrum - Revision history2024-03-28T18:56:03ZRevision history for this page on the wikiMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=338248&oldid=prev1234231587678 at 20:32, 26 March 20242024-03-26T20:32:46Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 20:32, 26 March 2024</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l73" >Line 73:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:*The wave [A row of people does a wave.]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:*The wave [A row of people does a wave.]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>:[Three parallel scales are across the bottom. The first is lambda (m), ranging from 100Mm to 100fm; second is f (Hz), which starts at 1 Hz and reaches 100 THz about 2/3 of the way along, after which the labels read "other entertaining greek prefixes like peta- exa- and zappa-;" last is Q (<del class="diffchange diffchange-inline">Gal^2</del>/Coloumb), whose labels are 17, 117, pi, 17, 42, phi, e^pi-pi, -2, 540^50, and <del class="diffchange diffchange-inline">11^2</del>. Above the scales and lined up accurately with the first two are the following:]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>:[Three parallel scales are across the bottom. The first is lambda (m), ranging from 100Mm to 100fm; second is f (Hz), which starts at 1 Hz and reaches 100 THz about 2/3 of the way along, after which the labels read "other entertaining greek prefixes like peta- exa- and zappa-;" last is Q (<ins class="diffchange diffchange-inline">Gal²</ins>/Coloumb), whose labels are 17, 117, pi, 17, 42, phi, e^pi-pi, -2, 540^50, and <ins class="diffchange diffchange-inline">11²</ins>. Above the scales and lined up accurately with the first two are the following:]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:*Power & Telephone (100Mm to 1km)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:*Power & Telephone (100Mm to 1km)</div></td></tr>
</table>1234231587678https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=338247&oldid=prev1234231587678 at 20:31, 26 March 20242024-03-26T20:31:53Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 20:31, 26 March 2024</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l14" >Line 14:</td>
<td colspan="2" class="diff-lineno">Line 14:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>In 1887, the {{w|Michelson–Morley experiment}} proved for the first time that the {{w|aether theory}} was wrong. The year (1897) cited underneath the comic title may be an incorrectly-dated reference to this experiment. Nevertheless, after that time, many physicists like {{w|Hendrik Lorentz}} or {{w|Joseph Larmor}} were still working on some aether theories. {{w|Albert Einstein}}'s theory of {{w|Special Relativity}} in 1905 helped explain the theoretical basis for the lack of aether and was a definitive step in discarding previous work.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>In 1887, the {{w|Michelson–Morley experiment}} proved for the first time that the {{w|aether theory}} was wrong. The year (1897) cited underneath the comic title may be an incorrectly-dated reference to this experiment. Nevertheless, after that time, many physicists like {{w|Hendrik Lorentz}} or {{w|Joseph Larmor}} were still working on some aether theories. {{w|Albert Einstein}}'s theory of {{w|Special Relativity}} in 1905 helped explain the theoretical basis for the lack of aether and was a definitive step in discarding previous work.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The wavelength starts at high values on the left and decreases in a {{w|logarithmic scale}} to the right. As a result of the inverse relationship between frequency and wavelength, the frequency scale starts at low values and increases logarithmically<del class="diffchange diffchange-inline">. The nonsense ''Q'' parameter does not change monotonically with either frequency or wavelength</del>. Both scales are labeled with powers of ten and with {{w|metric prefix}}es. For frequencies above 100 {{w|tera-}}Hertz, it just says "other entertaining Greek prefixes like {{w|peta-}} and {{w|exa-}} and zappa-." The last prefix should be {{w|zetta-}} (denoting a factor of 10<sup>21</sup>), but is intentionally mislabelled, referencing musician {{w|Frank Zappa}}.  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The wavelength starts at high values on the left and decreases in a {{w|logarithmic scale}} to the right. As a result of the inverse relationship between frequency and wavelength, the frequency scale starts at low values and increases logarithmically. Both scales are labeled with powers of ten and with {{w|metric prefix}}es. For frequencies above 100 {{w|tera-}}Hertz, it just says "other entertaining Greek prefixes like {{w|peta-}} and {{w|exa-}} and zappa-." The last prefix should be {{w|zetta-}} (denoting a factor of 10<sup>21</sup>), but is intentionally mislabelled, referencing musician {{w|Frank Zappa}}<ins class="diffchange diffchange-inline">. The nonsense ''Q'' parameter does not change monotonically with either frequency or wavelength. On the scale, there is 17, an unlucky number in Italy. Next to it, Randall seems to offer an alternative, 117. After that, {{w|pi}}, a mathematical constant, is followed by another 17 and then by 42, the answer to Life, the Universe and Everything. Then, there is {{w|Golden Ratio|phi}}, another mathematical constant, followed by e to the pi minus pi, a joke referencing [[217: e to the pi Minus pi]]. To make this scale even more absurd, Randall adds -2, 540^50, 12 and 11² to the end of the scale</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>;Other waves</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>;Other waves</div></td></tr>
</table>1234231587678https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=330106&oldid=prev172.69.195.120 at 14:35, 4 December 20232023-12-04T14:35:05Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 14:35, 4 December 2023</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8" >Line 8:</td>
<td colspan="2" class="diff-lineno">Line 8:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Explanation==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Explanation==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">{{incomplete|Many things in this comic, with the most notable being the absorption spectra, are not in the explanation.}}</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This panel is a play on the {{w|Electromagnetic spectrum}}, showing a large piece of the spectrum and examples of phenomena that absorb or emit light along the spectra. Such spectra are commonly used in physics or astronomy education contexts when discussing the nature of light. This comic extends it to absurd lengths by including examples that may be variously hyper-specific, humorous, or non-EM phenomena.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This panel is a play on the {{w|Electromagnetic spectrum}}, showing a large piece of the spectrum and examples of phenomena that absorb or emit light along the spectra. Such spectra are commonly used in physics or astronomy education contexts when discussing the nature of light. This comic extends it to absurd lengths by including examples that may be variously hyper-specific, humorous, or non-EM phenomena.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
</table>172.69.195.120https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=330027&oldid=prev172.71.182.47: Don't know why it didn't work before2023-12-02T07:22:08Z<p>Don't know why it didn't work before</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 07:22, 2 December 2023</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8" >Line 8:</td>
<td colspan="2" class="diff-lineno">Line 8:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Explanation==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Explanation==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{incomplete<del class="diffchange diffchange-inline">|</del>|Many things in this comic, with the most notable being the absorption spectra, are not in the explanation.}}</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{incomplete|Many things in this comic, with the most notable being the absorption spectra, are not in the explanation.}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This panel is a play on the {{w|Electromagnetic spectrum}}, showing a large piece of the spectrum and examples of phenomena that absorb or emit light along the spectra. Such spectra are commonly used in physics or astronomy education contexts when discussing the nature of light. This comic extends it to absurd lengths by including examples that may be variously hyper-specific, humorous, or non-EM phenomena.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This panel is a play on the {{w|Electromagnetic spectrum}}, showing a large piece of the spectrum and examples of phenomena that absorb or emit light along the spectra. Such spectra are commonly used in physics or astronomy education contexts when discussing the nature of light. This comic extends it to absurd lengths by including examples that may be variously hyper-specific, humorous, or non-EM phenomena.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
</table>172.71.182.47https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=330026&oldid=prev172.69.150.174: Incomplete2023-12-02T07:17:32Z<p>Incomplete</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 07:17, 2 December 2023</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8" >Line 8:</td>
<td colspan="2" class="diff-lineno">Line 8:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Explanation==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==Explanation==</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{incomplete||Many things in this comic, with the most notable being the absorption spectra, are not in the explanation.}}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This panel is a play on the {{w|Electromagnetic spectrum}}, showing a large piece of the spectrum and examples of phenomena that absorb or emit light along the spectra. Such spectra are commonly used in physics or astronomy education contexts when discussing the nature of light. This comic extends it to absurd lengths by including examples that may be variously hyper-specific, humorous, or non-EM phenomena.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>This panel is a play on the {{w|Electromagnetic spectrum}}, showing a large piece of the spectrum and examples of phenomena that absorb or emit light along the spectra. Such spectra are commonly used in physics or astronomy education contexts when discussing the nature of light. This comic extends it to absurd lengths by including examples that may be variously hyper-specific, humorous, or non-EM phenomena.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
</table>172.69.150.174https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=323031&oldid=prevFaviFake: /* Trivia */ Updated xkcd store link with Web archive link2023-09-01T09:32:13Z<p><span dir="auto"><span class="autocomment">Trivia: </span> Updated xkcd store link with Web archive link</span></p>
<a href="//www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=323031&oldid=305506">Show changes</a>FaviFakehttps://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=305506&oldid=prevWhoop whoop pull up: /* The comic in detail */2023-01-30T08:42:09Z<p><span dir="auto"><span class="autocomment">The comic in detail</span></span></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 08:42, 30 January 2023</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l36" >Line 36:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*The rays controlling {{w|Steve Ballmer}} are nonsense, but may reference real {{w|Balmer series}}, a set of transitions in the hydrogen atom that produce photons in the optical and ultraviolet light range.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*The rays controlling {{w|Steve Ballmer}} are nonsense, but may reference real {{w|Balmer series}}, a set of transitions in the hydrogen atom that produce photons in the optical and ultraviolet light range.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*AM {{w|Amplitude modulation}}, VHF {{w|Very high frequency}}, and UHF {{w|Ultra high frequency}} are frequency ranges approved for commercial broadcasting companies.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*AM {{w|Amplitude modulation}}, VHF {{w|Very high frequency}}, and UHF {{w|Ultra high frequency}} are frequency ranges approved for commercial broadcasting companies.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*Cell phone cancer rays is playing with the belief of many people that cell phones may cause cancer.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*<ins class="diffchange diffchange-inline">"</ins>Cell phone cancer rays<ins class="diffchange diffchange-inline">" </ins>is playing with the belief of many people that cell phones may cause cancer.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*Aliens belong to a range slightly higher than the frequencies used by human communications. So they can't hear us.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*Aliens belong to a range slightly higher than the frequencies used by human communications. So they can't hear us.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
</table>Whoop whoop pull uphttps://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=297310&oldid=prevJLZ0kTC5 at 15:18, 21 October 20222022-10-21T15:18:35Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 15:18, 21 October 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l55" >Line 55:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Visible light'''</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Visible light'''</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*At the bottom, it is split into "visible light" and "visible dark." While dark is the opposite of light in many grammatical contexts, in the physical sense it only reflects the absence of visible photons.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*At the bottom, it is split into "visible light" and "visible dark." While dark is the opposite of light in many grammatical contexts, in the physical sense it only reflects the absence of visible photons.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*The human visible spectrum is shown by all colors, including {{w|octarine}}, the <del class="diffchange diffchange-inline">colour </del>of magic on the fictional {{w|Discworld}} (in the books by {{w|Terry Pratchett}}).</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>*The human visible spectrum is shown by all colors, including {{w|octarine}}, the <ins class="diffchange diffchange-inline">color </ins>of magic on the fictional {{w|Discworld}} (in the books by {{w|Terry Pratchett}}).</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*On top, there are two {{w|absorption spectrum|absorption spectra}}, hydrogen and helium. These are the two most common elements in the Sun, and their presence in the Sun's outer envelope and Earth's atmosphere does block some small frequencies from the Sun.  Next come two cases of {{w|Absorption (chemistry)|absorption}} in the chemical/technical meaning:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*On top, there are two {{w|absorption spectrum|absorption spectra}}, hydrogen and helium. These are the two most common elements in the Sun, and their presence in the Sun's outer envelope and Earth's atmosphere does block some small frequencies from the Sun.  Next come two cases of {{w|Absorption (chemistry)|absorption}} in the chemical/technical meaning:</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>**{{w|Depends}} is a brand of underwear for adults experiencing urinary or fecal incontinence. The color is consequently yellow.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>**{{w|Depends}} is a brand of underwear for adults experiencing urinary or fecal incontinence. The color is consequently yellow.</div></td></tr>
</table>JLZ0kTC5https://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=284026&oldid=prevTheusaf: Reverted edits by Donald Trump (talk) to last revision by CRLF2022-05-26T20:02:08Z<p>Reverted edits by <a href="/wiki/index.php/Special:Contributions/Donald_Trump" title="Special:Contributions/Donald Trump">Donald Trump</a> (<a href="/wiki/index.php?title=User_talk:Donald_Trump&action=edit&redlink=1" class="new" title="User talk:Donald Trump (page does not exist)">talk</a>) to last revision by <a href="/wiki/index.php/User:CRLF" title="User:CRLF">CRLF</a></p>
<a href="//www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=284026&oldid=281278">Show changes</a>Theusafhttps://www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=281278&oldid=prevDonald Trump: Reverted edit by anti-crap user2022-05-26T18:52:11Z<p>Reverted edit by anti-crap user</p>
<a href="//www.explainxkcd.com/wiki/index.php?title=273:_Electromagnetic_Spectrum&diff=281278&oldid=281011">Show changes</a>Donald Trump