First slide

Doppler

Question

An observer starts moving with uniform acceleration a towards a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency, heard by the observer varies with time as

Moderate

A
B
C
D

Solution

For observer approaching a stationary source
$n^{'} = \frac{v + v_{0}}{v} . n$ and given $v_{0} = at \Rightarrow n^{'} = (\frac{an}{v}) t + n$ this is the equation of straight line with positive intercept n and positive slope ( $\frac{n}{v}$ ).

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