JEE Advanced 2021 Physics question
A source, approaching with speed towards the open end of a stationary pipe of length , is emitting a sound of frequency . The farther end of the pipe is closed. The speed of sound in air is and is the fundamental frequency of the pipe. For which of the following combination(s) of and , will the sound reaching the pipe lead to a resonance?
Answer: (A),(D)
Solution
A pipe closed at one end resonates only at odd harmonics: The frequency received by the stationary pipe from the approaching source is . For : . (A) $f'
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