SAT Subject Physics Practice Question 378: Answer and Explanation
74. Einstein's theory of relativity is based on which of the following statements?
A. Mass and energy are equivalent.
B. The velocity of light is a constant.
C. Space and time are anomalies.
D. All particles have antiparticles.
E. Energy is infinite.
Correct Answer: B
The correct answer is (B). One of the basic postulates in Einstein's Theory of Relativity is the speed of light, which is constant for everyone.