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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

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=v4l 250=v4× 0.2 v=200 m/s

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