A person standing on a road sends a sound signal to the driver of a car going away from him at a speed of 72 km h -1 . The signal travelling at 330 m s -1 , in air and having a frequency of 1600 Hz gets reflected from the body of the cur and returns. Find the frequency of the reflected signal as heard by the person.

Question

Philoid · Accepted Answer

The frequency received by the car is,

After that when the reflection occurs, this frequency becomes the source frequency. So,

Here,

v=330 m/s

f₀ = 1600 Hz

v_s=72 kmph = 20m/s

v_o=72 kmph = 20m/s