AP Physics 1 Question 81: Answer and Explanation
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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.