SAT Subject Physics Practice Question 423: Answer and Explanation

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Question: 423

14. Some opera singers are able to use their voice to shatter a crystal glass. They can do this because of

A. acoustic reflection.
B. multiple echoes.
C. interference.
D. resonance.
E. beats.

Correct Answer: D


The correct answer is (D). If the input frequency of a wave system is equal to its vibrating frequency, the resonant system acts to amplify the waves, thus transferring their energy into the delicate crystal and breaking it.

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