AP Physics 1 Question 81: Answer and Explanation

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Question: 81

1. A sound wave with frequency f travels through air at speed v. With what speed will a sound wave with frequency 4f travel through the air?

  • A. v/4
  • B. v
  • C. 2v
  • D. 4v

Correct Answer: B


B Since the wave speed is independent of the frequency, the speed is still v. This is Big Wave Rule #1. The wave with frequency 4f will have 1/4 the wavelength, but the wave speed will stay the same.