SAT Subject Physics Practice Question 111: Answer and Explanation

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Question: 111

6. A string, fixed at both ends, has a length of 6 m and supports a standing wave with a total of 4 nodes. If a transverse wave can travel at 40 m/s down the rope, what is the frequency of this standing wave?

A. 6.7 Hz
B. 10.0 Hz
C. 13.3 Hz
D. 20.0 Hz
E. 26.7 Hz

Correct Answer: B


We found in the previous question that λ = 4 m. Since v = 40 m/s, the frequency of this standing wave must be

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