SAT Subject Physics Practice Question 449: Answer and Explanation

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Question: 449

10. Einstein based his theory of relativity on the postulate that

A. photoelectrons absorb and emit photons.
B. the velocity of light is the same for all observers.
C. mass and energy are intra-convertible.
D. the universe is an entropic system.
E. energy and momentum are conserved.

Correct Answer: B

Explanation:

The correct answer is (B). One of two postulates of Einstein's theory of special relativity is that the speed of light in a vacuum is the same for all observers.

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