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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectMedium2 minPYQ_2015

PhysicsMediumsingle choice

$A$ train is moving with a uniform speed $c^{2}$ $33 m / s$ and an observer is approaching the train with the same speed. If the train blows a whistle of frequency $1000 Hz$ and the velocity of sound is $333 m / s,$ then the apparent frequency of the sound that the observer hears is

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Solution:

We have, Apparent frequency, $v = (\frac{v + u _{0}}{v - u _{s}}) v_{0} = (\frac{333 + 33}{333 - 33}) \times 1000 = \frac{366}{300} \times 1000 = 1220 Hz$

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

⏱ 2mℹ️ Source: PYQ_2015

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