An observer moves towards a stationary source of sound with a velocity of one-fifth of the velocity of sound. The percentage increase in the apparent frequency is

Step-by-step solution

When observer moves towards the stationary source then apparent frequency, n ^ = ( v + v _ o v ) n Given, v _ o = v / 5 . n ^ = ( v + v 5 v ) n = 6 5 n Increase in apparent frequency = n ^ - n = 6 5 n - n = 1 5 n 20 % of n