Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectMedium2 minPYQ_2020

PhysicsMediumsingle choice

A sound wave of frequency $f$ propagating through the air at a speed $c$ is reflected from a surface which is moving away from the source with a constant speed $v$ . The frequency of the reflected wave as perceived by the observer at the position of the source will be

Options:

Answer:

Solution:

In the first case observer (surface) is moving away, so the perceived frequency is

$f^{'} = f (\frac{c - v}{c})$

In the second case source (surface) is moving away, so the perceived frequency is

$f^{″} = f^{'} (\frac{c}{c + v}) = f (\frac{c - v}{c + v})$

Stream:JEESubject:PhysicsTopic:Sound WaveSubtopic:Dopler's effect

⏱ 2mℹ️ Source: PYQ_2020

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