Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectEasy2 minPYQ_2020

PhysicsEasysingle choice

A train moves towards a stationary observer with speed $34 m s^{- 1}$ . The train sounds a whistle and its frequency registered by the observer is $f_{1}$ . If the train's speed is reduced to $17 m s^{- 1}$ , the frequency registered is $f_{2}$ . If the speed of sound is $340 m s^{- 1}$ then the ratio $\frac{f_{1}}{f_{2}}$ is

Options:

Answer:

Solution:

$f_{1} = f (\frac{v}{v - v_{s}})$

$f_{1} = f (\frac{340}{340 - 34}) = f (\frac{340}{306})$

And $f_{2} = f (\frac{340}{340 - 17}) = f (\frac{340}{323})$

$∴ \frac{f_{1}}{f_{2}} = \frac{323}{306} = \frac{19}{18}$

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

⏱ 2mℹ️ Source: PYQ_2020

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