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A source approaching with speed u toward...

A source approaching with speed u towards the open end of a stationary pipe of length L is emitting a sound of frequency `f_s`. The farther end of the pipe is closed. The speed of sound in air is v anf `f_0` is the fundamental frequency of the pipe. For which of the following combination of u and `f_s` will the sound reaching the pipe lead to a resistance.

A

`u = 0.8v` anf `f_s = f_0`

B

`u = 0.8v` anf `f_s = 2f_0`

C

`u = 0.8v` anf `f_s = 0.5f_0`

D

`u = 0.5v` anf `f_s = 1.5f_0`

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