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Question

A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30 cm and l2=70 cm. Then v is equal to

A
384 ms1
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B
338 ms1
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C
379 ms1
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D
332 ms1
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Solution

The correct option is A 384 ms1
Given,

f=480 Hz
l1=30 cm
l2=70 cm
The speed of sound (v) in air by resonance tube method is given by,
v=2f(l2l1)
v=2×480×(7030)×102
v=38400×102 m/s
v=384 m/s
Final answer: (c)

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