SAT Subject Physics Practice Question 121: Answer and Explanation

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Question: 121

4. When green light (wavelength = 500 nm in air) travels through diamond (refractive index = 2.4), what is its wavelength?

A. 208 nm
B. 357 nm
C. 500 nm
D. 700 nm
E. 1,200 nm

Correct Answer: A


The frequency is unchanged, but because the speed of light in diamond is less than in air, the wavelength of the light in diamond is shorter than its wavelength in air.

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