Asked by Anon

You are approaching a stoplight. If the frequency of the light being emitted is approximately 520 THz, what was the wavelength of the light? What color was the light?

v = c/λ

520 THz --> 5.2x10^14 Hz

5.2x10^14 Hz = 3.0x10^8 m/s

λ = 1.56 x 10^23 m

Not sure how to get the color of the light from here.

Answers

Answered by DrBob222
First you need to calculate the wavelength correctly.I can't make the symbols you did but it is
c = freq x wavelength
3E8 = 5.2E14 x wavelength
wavelength = 3E8/5.2E14 = 5.77E-7 m and that converted to 577E-9 m (or 577 nm). Here is a chart that will show you the color. It's yellow-orange.
https://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html
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