Question

The difference between the apparent frequency of a source as perceived by an observer during its approaching and recession is 2% of the natural frequency of the source. Find the velocity of the source. Take the velocity of sound as 350 m/s.

Answer 1

By the Doppler’s method use the formula for apparent frequency in terms of source velocity to express the difference in two frequencies of approach and recession of the source in terms of its velocity.

For the source approaching a stationary observer,

Percentage change in frequency = (2v_s) x 100 = 2