Two factories are sounding their sirens at 800 Hz . A man goes from one factory to other at a speed of 2 ~m / s . The velocity of sound is 320 ~m / s . The number of beats heard by the person in one second will be:

Step-by-step solution

Given: Frequency of sound produced by siren, f=800 ~Hz Speed of observer, u=2 ~m / s Velocity of sound, v=320 ~m / s No. of beats heard per second = ? No. of extra waves received by the observer per second = 4 No. of beats/ sec aligned &= 2 - (- 2 )= 4 &= 2 2 320 800 ( = V f ) &= 2 2 800 320 =10 aligned