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State the expression for apparent frequency when source is stationary and listener is 

1) moving towards the source 

2) moving away from the source

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1 Answers

Let, 

n = actual frequency of the source.

n0 = apparent frequency of the source, 

v = velocity of sound in air. 

vs = velocity of the source. 

vl = velocity of the listener.

i. If listener is moving towards source then apparent frequency is given by,

\(n = n_0(\frac{v + v_L}{v})\) i.e., apparent frequency increases.

ii. If listener is receding away from source then apparent frequency is given by,

\(n = n_0(\frac{v - v_L}{v})\) i.e., apparent frequency decreases.

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