Specifically, the light we call "green" which indicates "go".
Did you know that in Japan, they call that light ao (青), which translates as blue? The actual traffic lights in Japan don't seem to be much bluer than those in America though. I discovered this odd difference one day when I was in the car with my Japanese wife, when I didn't notice that the light had change, and she said "it turned blue," which had me nonplussed. (And some countries call the yellow light amber.)
Seems that a more accurate description might actually be cyan, but people don't use the word cyan very often.
According to this:
https://archive.education.mrsec.wisc...ht/spectra.htm
The peak wavelength for a green traffic signal light (LED) is 500 nm.
According to Wikipedia, green wavelengths are from 495–570 nm while blue wavelengths are from 450–495 nm. So that would put it in the green range, but very close to the blue end of green. Meanwhile, the range for cyan is given as 490–520 nm, which overlaps both green and blue, and 500 nm is pretty close to the middle of that range.
https://en.wikipedia.org/wiki/Cyan
https://en.wikipedia.org/wiki/Green
https://en.wikipedia.org/wiki/Blue
If you know about how most printers make their colors, the colors they use are actually cyan, magenta, yellow and black (not red green and blue)
https://en.wikipedia.org/wiki/CMYK_color_model
But other than that, in everyday language, nobody ever seems to use the word "cyan," do they?
Did you know that in Japan, they call that light ao (青), which translates as blue? The actual traffic lights in Japan don't seem to be much bluer than those in America though. I discovered this odd difference one day when I was in the car with my Japanese wife, when I didn't notice that the light had change, and she said "it turned blue," which had me nonplussed. (And some countries call the yellow light amber.)
Seems that a more accurate description might actually be cyan, but people don't use the word cyan very often.
According to this:
https://archive.education.mrsec.wisc...ht/spectra.htm
The peak wavelength for a green traffic signal light (LED) is 500 nm.
According to Wikipedia, green wavelengths are from 495–570 nm while blue wavelengths are from 450–495 nm. So that would put it in the green range, but very close to the blue end of green. Meanwhile, the range for cyan is given as 490–520 nm, which overlaps both green and blue, and 500 nm is pretty close to the middle of that range.
https://en.wikipedia.org/wiki/Cyan
https://en.wikipedia.org/wiki/Green
https://en.wikipedia.org/wiki/Blue
If you know about how most printers make their colors, the colors they use are actually cyan, magenta, yellow and black (not red green and blue)
https://en.wikipedia.org/wiki/CMYK_color_model
But other than that, in everyday language, nobody ever seems to use the word "cyan," do they?
via International Skeptics Forum https://ift.tt/35nhTib
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