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Waves question

2021 · Shift 2 · Q40
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Waves question

2021 · Shift 2 · Q40

JEE AdvancedPhysicsWavesMultiple correct+4 / −2
A source, approaching with speed u towards the open end of a stationary pipe of length L, is emitting a sound of frequency fs. The farther end of the pipe is closed. The speed of sound in air is v and f0 is the fundamental frequency of the pipe. For which of the following combination(s) of u and fs, will the sound reaching the pipe lead to a resonance?
  1. A
    u = 0.8v and fs = f0
  2. B
    u = 0.8v and fs = 2f0
  3. C
    u = 0.8v and fs = 0.5f0
  4. D
    u = 0.5v and fs = 1.5f0
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