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Wavelength

How many vibr...

Question

How many vibration will a running fork of frequency 280hz will complete during the time sound travel formed in air by 20m. Take speed of sound in air as 340m/s

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Solution

Given:
Speed of sound=340m/s
Distance=20m
Speed =distance/time
time=distance/speed
time=20/340
=0.05sec
Frequency=280Hz
Frequency= No.of Vibrations in one second=280Hz
Therefore number of Vibrations completed in 0.05sec
=280x0.05=14 Vibrations

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