Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectMedium2 minPYQ_2020

PhysicsMediumsingle choice

A bus is moving with a velocity of $5 m s^{- 1}$ towards a huge wall. The driver sounds a horn of frequency $165 Hz$ . If the speed of sound in air is $335 m s^{- 1}$ , the number of beats heard per second by a passenger inside the bus will be

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Answer:

Solution:

Apparent frequency

$v^{'} = v (\frac{v - v_{L}}{v - v_{s}})$

$= 165 (\frac{355 + 5}{355 - 5})$

$(∵ v_{L} = - 5 m s^{- 1}, v_{s} = 5 m s^{- 1})$

$= 165 \times \frac{340}{330} = 170 Hz$

Therefore, the number of beats heard

$= 170 - 165 = 5$

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

⏱ 2mℹ️ Source: PYQ_2020

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