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Question

A resonance air column of length 20 cm resonates with a tuning fork of frequency

250 Hz. The speed of sound in air is

[AFMC 1999; BHU 2000; CPMT 2001]


A

300 m/s

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B

200 m/s

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C

150 m/s

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D

75 m/s

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Solution

The correct option is B

200 m/s


For closed pipe n1=v4l250=v4×0.2v=200m/s


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