4
votes
How was the speed of colored light measured in a vacuum?
The experiment that I am aware of which places the tightest limits is
Schaefer. Severe Limits on Variations of the Speed of Light with Frequency. phys.rev.lett. 82:4964-4966. 1999.
https://arxiv.org/...
- 105k
3
votes
What would the RGB color value of an infinitely hot blackbody be?
The RGB color value of an infinitely hot blackbody approaches a very pale blue as temperature increases. This theoretical limit is calculated using blackbody radiation principles and color science. ...
- 131
3
votes
Creating pure monochromes by separating constituent waves
A filter that removes all frequency components outside a finite bandwidth, (compact support), must have an infinite long impulse response, see the Paley-Wiener theorem. As a consequence, no signal ...
- 20.2k
2
votes
Creating pure monochromes by separating constituent waves
No filter will produce an ABSOLUTE 'pure monochrome'; there are line width limitations in colored-glass items, diffraction gratings have some non ideal features that are related to the 'blaze' ...
- 10.1k
1
vote
Won't the violet color of rainbow be mixed with some IBGYOR?
You are correct; Only the red is pure, and all the other colours will have a bit of the outer colours mixing into them. You are also correct that the standard textbook treatments and video treatments ...
- 10.2k
1
vote
If light can't have relative speed, does it get left behind the earth imperceptibly?
Light travels at the same speed in all reference frames. This fact is well supported by experiments (starting with the famous experiment of Michelson and Morley). Furthermore, consequences of this ...
- 505
1
vote
Why is a black hole black, according to theory (and observation, and ignoring QM & Hawking radiation)?
Kruskal-Szekeres coordinates as depicted in the diagram below give a very intuitive picture of why nothing can leave a black hole.
The blue and red vectors represent the null worldlines of light ...
- 7,606
1
vote
Why don't objects get brighter when I reflect their light back at them?
As noted in answers by @filip-milovanović, @gomennathan, and @martin-kvík-baláž, objects do get brighter when their light is reflected back on to them, but the effect is too small to be seen by eye ...
- 11.9k
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