SAT Subject Physics Practice Question 501: Answer and Explanation

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Question: 501

2.

In the diagram above the open pipe produces a standing wave as shown. What is the frequency of the sound produced in Hertz? (Velocity of sound = 360m/s)

A. 900 Hz
B. 1800 Hz
C. 720 Hz
D. 1440 Hz
E. 2700 Hz

Correct Answer: B

Explanation:

The correct answer is (B). Look at the pipe carefully and there are two complete waves in the pipe. Since the pipe is 40 cm long, the wavelength of the waves is .2 m. Solve for the frequency of the wave with f = v/λ.

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