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(a) What is Dappler effect? The freque...

(a) What is Dappler effect?
The frequency r of a source of sound appears to be n' to a stationary listener when the source is moving with velocity `V_s` away from him. The velocity of sound is V. Write an expression for n' in terms of r, `V and V_s`.
(b) Distinguish between the characteristics of progressive and stationary waves. Use diagrams to distinguish.

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