AP Physics 1 Question 411: Answer and Explanation

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Question: 411

9. What is the difference between the wavelengths of the 3rd and 4th harmonics of a standing wave fixed at both ends?

  • A.
  • B.
  • C.
  • D.

Correct Answer: C



The harmonic wavelengths of standing waves fixed at both ends are given by the equation . The wavelength of the third harmonic then is , and the wavelength of the fourth harmonic is . The difference between the wavelengths of these two harmonics is equal to .