Editing 1733: Solar Spectrum
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==Explanation== | ==Explanation== | ||
− | + | {{incomplete|Examples of such advertisements needed}} | |
− | This comic's release day was postponed from the scheduled Wednesday release to a [[:Category:Thursday comics|Thursday release]] because | + | This comic's release day was postponed from the scheduled Wednesday release to a [[:Category:Thursday comics|Thursday release]] because of the popularity of the previous Monday comic [[1732: Earth Temperature Timeline]]. [[Randall]] even explained this in the header text, see [[1732#Popularity_of_comic|this trivia item from the previous comic]]. |
− | This comic depicts the {{w|Fraunhofer lines}}, i.e. the {{w|spectral lines}} seen when sunlight is split in a {{w|spectrometer}}. These appear as black gaps in the rainbow of light, caused by light being absorbed by {{w | + | This comic depicts the {{w|Fraunhofer lines}}, i.e. the {{w|spectral lines}} seen when sunlight is split in a {{w|spectrometer}}. These appear as black gaps in the rainbow of light, caused by light being absorbed by {{w|elements}} in the {w|Sun}}. The frequencies of light that an atom absorbs depend on the exact arrangement of electron orbitals around it - because each element has a different pattern of orbitals, each one has a distinctive pattern in the absorption spectrum. The chart shows most of the main lines in the visible spectrum and identifies the elements linked to them. |
− | The image of the Fraunhofer lines from Wikipedia is shown below in the section with a [[#Table of spectrum|table]] of these lines. Here it can be seen that all the lines that are labeled with | + | The image of the Fraunhofer lines from Wikipedia is shown below in the section with a [[#Table of spectrum|table]] of these lines. Here it can be seen that all the lines that are labeled are labeled with element are correctly labeled. Also all lines shown in the part of the spectrum included in the comic are included. Ten of the lines included are not labeled in the picture on Wikipedia (at least not with an element, two of the three "h" labels are not in the table on Wikipedia). Five of these also have no label in the comic. But the other five line's label ''Those giant sunglasses'' constitute the joke of the comic |
− | All ten extra lines (including both the labeled and unlabeled ones) seem to correspond to the [http://astro.u-strasbg.fr/~koppen/discharge/silicon.jpg spectrum of silicon], and | + | All ten extra lines (including both the labeled and unlabeled ones) seem to correspond to the [http://astro.u-strasbg.fr/~koppen/discharge/silicon.jpg spectrum of silicon], and the joke then refers to the {{w|silicon dioxide}} (aka glass) used in the lenses of the Sun's sunglasses. Of course, this means that the glasses have been ionized and turned into plasma by the heat of the sun. |
− | The idea of a sun with sunglasses is a reference to pictures/clipart of the sun wearing sunglasses, often used to denote good weather | + | The idea of a sun with sunglasses is a reference to pictures/clipart of the sun wearing sunglasses, often used to denote good weather. The title text is most likely a reference to a specific advert using this image or [https://what-if.xkcd.com/115/ this What If]. |
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− | + | Transitions® is a brand of [//en.wikipedia.org/wiki/Photochromic_lens photochromic] lenses; however, photochromic lenses are often referred to as "transition lenses", so the title text does not necessarily refer to the brand. Photochromic lenses are a type of plastic lens used in prescription spectacles that allow the lens to turn dark when exposed to UV light such as that found in sunlight. The sun choosing to get transition lens would prove a waste of money as the lenses would be permanently transitioned to be dark, so a pair of ordinary sunglasses would likely have proved more cost effective. | |
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===Table of spectrum=== | ===Table of spectrum=== | ||
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**'''Note that they are labeled from right to left!''' | **'''Note that they are labeled from right to left!''' | ||
*Then the element causing the line is mentioned. ''Unlabeled'' is used if the line is not mentioned in the table from Wikipedia. | *Then the element causing the line is mentioned. ''Unlabeled'' is used if the line is not mentioned in the table from Wikipedia. | ||
− | *Then follows the wavelength. It is given with decimals if it is noted in the table from Wikipedia. Else it has been read | + | *Then follows the wavelength. It is given with decimals if it is noted in the table from Wikipedia. Else it has been read of manually from the picture above. |
*Then follows the label given in this comic, with unlabeled meaning that it is not labeled in the comic but still shown. | *Then follows the label given in this comic, with unlabeled meaning that it is not labeled in the comic but still shown. | ||
**If the line is not even included in the xkcd comic "N/A" will be used. | **If the line is not even included in the xkcd comic "N/A" will be used. | ||
Line 50: | Line 43: | ||
|- | |- | ||
|A | |A | ||
− | + | |O<sub>2</sub> | |
|759.370 | |759.370 | ||
|N/A | |N/A | ||
− | |This line is outside | + | |This line is outside comics range. So are the two unlabeled lines shown in the spectrum in the picture above around 720 and 730 nm. There are also even more oxygen lines further out in the infrared part of the spectrum which is not even included in the picture above. |
|- | |- | ||
|None | |None | ||
Line 59: | Line 52: | ||
|690 | |690 | ||
|Those giant sunglasses 5 | |Those giant sunglasses 5 | ||
− | |This is the fifth of the five xkcd | + | |This is the fifth of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read of manually |
|- | |- | ||
|B | |B | ||
− | |O | + | |O<sub>2</sub> |
|686.719 | |686.719 | ||
|Oxygen 2 | |Oxygen 2 | ||
− | |Agreement | + | |Agreement |
|- | |- | ||
|None | |None | ||
Line 71: | Line 64: | ||
|577 | |577 | ||
|Those giant sunglasses 4 | |Those giant sunglasses 4 | ||
− | |This is the fourth of the five xkcd | + | |This is the fourth of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read of manually. |
|- | |- | ||
|None | |None | ||
Line 77: | Line 70: | ||
|660 | |660 | ||
|Unlabeled | |Unlabeled | ||
− | |This line is not labeled | + | |This line is not labeled either in the comic or in the picture above. Wavelength read of manually. It seems like this one was supposed to be one of the sunglasses lines, and then by mistake the arrow points to the labeled line C below. |
|- | |- | ||
|C | |C | ||
− | |{{w| | + | |{{w|Hα}} |
|656.281 | |656.281 | ||
|Those giant sunglasses 3 | |Those giant sunglasses 3 | ||
− | |This is the third of the five xkcd sunglass lines. This is actually | + | |This is the third of the five xkcd sunglass lines. This is actually a labeled line belonging to the hydrogen Balmer series. Seems like a mistake, and more likely it was meant for the arrow to point to the unlabeled line mentioned here above. |
|- | |- | ||
|None | |None | ||
Line 89: | Line 82: | ||
|645 | |645 | ||
|Those giant sunglasses 2 | |Those giant sunglasses 2 | ||
− | |This is the second of the five xkcd | + | |This is the second of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read of manually. |
|- | |- | ||
|a | |a | ||
− | |O | + | |O<sub>2</sub> |
|627.661 | |627.661 | ||
|Oxygen 1 | |Oxygen 1 | ||
− | |Agreement | + | |Agreement |
|- | |- | ||
|D<sub>1</sub> | |D<sub>1</sub> | ||
Line 101: | Line 94: | ||
|589.592 | |589.592 | ||
|Sodium 2 | |Sodium 2 | ||
− | |Agreement | + | |Agreement |
|- | |- | ||
|D<sub>2</sub> | |D<sub>2</sub> | ||
Line 107: | Line 100: | ||
|588.995 | |588.995 | ||
|Sodium 1 | |Sodium 1 | ||
− | |Agreement | + | |Agreement |
|- | |- | ||
|D<sub>3</sub> or d | |D<sub>3</sub> or d | ||
Line 113: | Line 106: | ||
|587.5618 | |587.5618 | ||
|N/A | |N/A | ||
− | |This line is so close to the nearest sodium line that only one line is visible, so | + | |This line is so close to the nearest sodium line that only one line is visible, so only one is shown, both in the comic and in the picture above. |
|- | |- | ||
|None | |None | ||
Line 119: | Line 112: | ||
|577 | |577 | ||
|Those giant sunglasses 1 | |Those giant sunglasses 1 | ||
− | |This is the first of the five xkcd | + | |This is the first of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read of manually. |
|- | |- | ||
|None | |None | ||
Line 125: | Line 118: | ||
|554 | |554 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength | + | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength read of manually. |
|- | |- | ||
|None | |None | ||
Line 131: | Line 124: | ||
|549 | |549 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength | + | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength read of manually. |
|- | |- | ||
|None | |None | ||
Line 137: | Line 130: | ||
|537 | |537 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength | + | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength read of manually. |
|- | |- | ||
|E<sub>2</sub> | |E<sub>2</sub> | ||
Line 149: | Line 142: | ||
|518.362 | |518.362 | ||
|Magnesium 2 | |Magnesium 2 | ||
− | |Agreement. See | + | |Agreement. See b below. |
|- | |- | ||
|b<sub>2</sub> | |b<sub>2</sub> | ||
Line 161: | Line 154: | ||
|516.891 | |516.891 | ||
|N/A | |N/A | ||
− | |This iron line and the next magnesium line are so close that only one is visible in the spectrum, so only one is shown, both in the comic and in the picture above. There is only one label for both visible lines showing them to be magnesium, even though there are four lines (this one is | + | |This iron line and the next magnesium line are so close that only one is visible in the spectrum, so only one is shown, both in the comic and in the picture above. There is only one label for both visible lines showing them to be magnesium, even though there are four lines one of which (this one is Iron). |
|- | |- | ||
|b<sub>4</sub> | |b<sub>4</sub> | ||
Line 167: | Line 160: | ||
|516.733 | |516.733 | ||
|Magnesium 1 | |Magnesium 1 | ||
− | |Agreement. See | + | |Agreement. See b above. |
|- | |- | ||
|c | |c | ||
Line 176: | Line 169: | ||
|- | |- | ||
|F | |F | ||
− | | | + | |{{w|Hβ}} |
|486.134 | |486.134 | ||
|Hydrogen 3 | |Hydrogen 3 | ||
− | |Agreement | + | |Agreement. |
|- | |- | ||
|h | |h | ||
Line 185: | Line 178: | ||
|476 | |476 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is also unlabeled in the table on Wikipedia. " | + | |Agreement. This line is also unlabeled in the table on Wikipedia. "h" is used between H and g below. The wavelength is manually read off from the image. |
|- | |- | ||
|d | |d | ||
Line 200: | Line 193: | ||
|- | |- | ||
|f | |f | ||
− | | | + | |{{w|Hγ}} |
|434.047 | |434.047 | ||
|Hydrogen 2 | |Hydrogen 2 | ||
− | |Agreement | + | |Agreement. |
|- | |- | ||
|G | |G | ||
Line 218: | Line 211: | ||
|- | |- | ||
|h | |h | ||
− | | | + | |{{w|Hδ}} |
|410.175 | |410.175 | ||
|Hydrogen 1 | |Hydrogen 1 | ||
− | |Agreement | + | |Agreement. |
|- | |- | ||
|H | |H | ||
− | |Ca | + | |Ca<sup>+</sup> |
|396.847 | |396.847 | ||
|Calcium 2 | |Calcium 2 | ||
Line 230: | Line 223: | ||
|- | |- | ||
|K | |K | ||
− | |Ca | + | |Ca<sup>+</sup> |
|393.366 | |393.366 | ||
|Calcium 1 | |Calcium 1 | ||
Line 247: | Line 240: | ||
:[Above the chart there are four and below the chart there are two labels, each label has one or more arrows pointing to different black lines. The two that has only one arrow points to two close lines marking them both. Only 22 lines are labeled like this, the other 6 are not labeled. The labels in reading order, with the number of arrows noted behind in square brackets:] | :[Above the chart there are four and below the chart there are two labels, each label has one or more arrows pointing to different black lines. The two that has only one arrow points to two close lines marking them both. Only 22 lines are labeled like this, the other 6 are not labeled. The labels in reading order, with the number of arrows noted behind in square brackets:] | ||
− | :Calcium [3] Iron [5] Sodium [1] Oxygen [2] | + | :Calcium [3] |
− | :Hydrogen [3] Magnesium [1] Those giant sunglasses [5] | + | :Iron [5] |
− | + | :Sodium [1] | |
− | + | :Oxygen [2] | |
− | + | :Hydrogen [3] | |
− | + | :Magnesium [1] | |
+ | :Those giant sunglasses [5] | ||
{{comic discussion}} | {{comic discussion}} | ||
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