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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectEasy2 minPYQ_2022

PhysicsEasysingle choice

A car sounding a horn of frequency $1000 Hz$ passes an observer. The ratio of frequencies of the both noted by the observer before and after passing of the car is 11:9. If the speed of sound is $V$ , the speed of the car is

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Solution:

$n_{Before} = (\frac{v}{v + v _{c}}) n$ And $n_{After} = (\frac{v}{v + v _{c}}) \cdot n$ $\frac{n _{Before}}{n _{After}} = \frac{11}{9} = (\frac{v + v _{c}}{v - v _{c}})$ $\Rightarrow v_{c} \Rightarrow \frac{v}{10}$

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

⏱ 2mℹ️ Source: PYQ_2022

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