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Doppler

Question

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

Moderate
Solution

When observer moves towards stationary source then apparent frequency 

n'=v+v0vn     =v+v/5vn      =1.2n

Increment in frequency = 0.2n

Percentage increase = 20%



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