Question

A body is vibrating 12000 times in 2 minutes.(speed of sound in air is 360m/s).Find:(ii)Wavelength of the wave produced.

Answer 1

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