A policeman blos a whistle of frequency 400Hz as a car speeds past him with a velocity
Channel: Doubtnut
Date: 2020-08-02

A policeman blos a whistle of frequency 400Hz as a car speeds past him with a velocity of `54km h^(-1)`. Find the cahnge in frequency as heard by the driver of the car just as he passes the policeman. Velocity of sound in air is `350ms^(-1)`