First slide

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
$\begin{array}{l} n' = [\frac{v + v_{0}}{v}] n \\ = [\frac{v + v / 5}{v}] n \\ = 1 .2 n \end{array}$
Increment in frequency = 0.2n
Percentage increase = 20%

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