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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 pipe. For which of the following combination(s) of u and fs will the wound reaching the pipe lead to a resonance?
A) u=0.8v and fs=f0
B) u=0.8v and fs=2f0
C) u=0.8v and fs=0.5f0
D) u=0.8v and fs=1.5f0

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