AP Physics 1 Question 456: Answer and Explanation

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Question: 456

4. A string of length 2 m that's fixed at both ends supports a standing wave with a wavelength of 0.8 m. What is the harmonic number of this standing wave?

  • A. 3
  • B. 4
  • C. 5
  • D. 6

Correct Answer: C



The length of the string is equal to 2.5λ, so

The expression for the wavelength of the nth harmonic is , so the harmonic number of the standing wave is 5.