SAT Subject Physics Practice Question 265: Answer and Explanation

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Question: 265

36. Of the following types of waves, which type travels at the greatest speed through vacuum?

A. Radio waves
B. Microwaves
C. Ultraviolet light
D. X-rays
E. None of the above; all these waves would travel at the same speed.

Correct Answer: E


All electromagnetic waves—regardless of frequency—travel at speed c (the speed of light) through vacuum.

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