Observer A sees a pendulum oscillating back and forth in a relativistic train and measures its period to be T_A. Observer B moves together with the train and measures the period of the pendulum to be T_B. These two results will be such that A) T_A T_B. B) T_A = T_B. C) T_A

Question

Observer A sees a pendulum oscillating back and forth in a relativistic train and measures its period to be T_A. Observer B moves together with the train and measures the period of the pendulum to be T_B. These two results will be such that A) T_A > T_B. B) T_A = T_B. C) T_A < T_B. D) T_A could be greater or smaller than T_B depending on the direction of the motion.

Quizplus · Accepted Answer

Due to time dilation in special relativity, the period measured by Observer A, who is stationary relative to the moving train, will be longer than the period measured by Observer B, who is moving with the train.

Observer a Sees a Pendulum Oscillating Back and Forth in a Relativistic