Question

An observer starts moving with uniform acceleration ‘a’ towards a stationary sound source of frequency f. As the observer approaches the source, the apparent frequency f’ heard by the observer varies with time t as:

Answer 1

The correct option

Explanation:

For observer approaching a stationary source 

n′=v+v₀/v.n and given v₀=at 

=>n′=(an/v) t+n  this is the equation of straight line with positive intercept n and positive slope (n/v)