Question

A body is vibrating 10000 times in one minute.
If the velocity of sound in air is 3100 m 5-1,
find (i) frequency of the vibration in Hz
(ii) wavelength of the sound produced. ​

Answer 1

(i) Frequency of vibration is defined as number of vibration per second ,

so , frequency , f=number of vibrations/time in second =7200/60=120Hz ,

(ii) Now given , v=360m/s and f=120Hz

by , v=fλ ,

or λ=v/f=360/120=3m

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