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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectEasy2 minPYQ_2020

PhysicsEasysingle choice

A police car with a siren of frequency $8 kHz$ is moving with uniform velocity $36 km h^{- 1}$ towards a tall building which reflects the sound waves. The speed of sound in air is $320 m s^{- 1}$ . The frequency of the siren heard by the car driver is

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Answer:

Solution:

$36 km h^{- 1}$ $= 36 \times \frac{5}{18} = 10 m s^{- 1}$

Apparent frequency of sound heard by car driver (observer)

$f^{''} = f (\frac{v + v_{o}}{v - v_{s}})$

$= 8 (\frac{320 + 10}{320 - 10})$

$f^{''} = 8 .5 kHz$

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

⏱ 2mℹ️ Source: PYQ_2020

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