SAT Subject Physics Practice Question 115: Answer and Explanation

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Question: 115

10. An organ pipe that’s closed at one end has a length of 17 cm. If the speed of sound through the air inside is 340 m/s, what is the pipe’s fundamental frequency?

A. 250 Hz
B. 500 Hz
C. 1,000 Hz
D. 1,500 Hz
E. 2,000 Hz

Correct Answer: B

Explanation:

An air column (such as an organ pipe) with one closed end resonates at frequencies given by the equation fn = for odd integers n. The fundamental frequency corresponds, by definition, to n = 1. Therefore

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