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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectMedium2 minPYQ_2020

PhysicsMediumsingle choice

An obstacle is moving towards the source with velocity 'v'. The sound is reflected from the obstacle. If ' $c^{'}$ is the speed of sound and $λ^{'}$ ' is the wavelength, then the wavelength of the reflected wave $(λ_{r})$ is

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Solution:

The frequency of reflected sound wave is $f_{r} = f (\frac{c + v}{c - v})$ $∵$ No change in velocity occurs due to reflection of sound wave. Hence, $\frac{c}{λ _{r}} = \frac{c}{λ} (\frac{c + v}{c - v}) \Rightarrow \frac{1}{λ _{r}} = \frac{1}{λ} (\frac{c + v}{c - v}) λ_{r} = \frac{c - v}{c + v} λ$

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

⏱ 2mℹ️ Source: PYQ_2020

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