AP Physics 1 Question 36: Answer and Explanation

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Question: 36


A tube with one end closed and one end open resonates for a wave with wavelength λa as shown. The next shorter wavelength at which resonance will occur is λb. The ratio of these two wavelengths λab is

  • A.
  • B.
  • C.
  • D.

Correct Answer: D


D Resonance occurs at λ = for odd integers. This means at 4L, L, L,…. We are shown a picture where a wave is in a tube of length L. This means λa = . The next shorter wavelength is λb = . The ratio of these is or or .