SAT Subject Physics Practice Question 384: Answer and Explanation

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Question: 384

5. A pendulum swings at a rate of .75 vibrations/second. The frequency of the vibrations would decrease because…

A. Mass of the bob was increased
B. Length of the pendulum was increased
C. Mass of the bob was decreased
D. Length of the pendulum was decreased
E. Displacement from zero was increased

Correct Answer: B


The correct answer is (B). The frequency is the inverse of the period. Lengthening the pendulum increases the length of the period, which means the frequency decreases.

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