A source emitting sound at frequency 4000 Hz, is moving along the Y-axis with a speed of 22 m s -1 , A listener is situated on the ground at the position (660 m, 0). Find the frequency of the sound received by the listener at the instant the source crosses the origin. Speed of sound in air = 330 m s -1 .

Question

Philoid · Accepted Answer

Let us assume when the source is at A it produces the sound that reaches P when the source comes to the origin. If v_s is the source velocity and v is the velocity of sound then,

And

Now we can find the cosine of the angle made.

The frequency will be,