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PhysicsSound WaveDopler's effectMedium2 minPYQ_2020

PhysicsMediumsingle choice

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

Options:

Answer:

Solution:

$f_{1} = (\frac{v}{v - v_{s}}) f = (\frac{340}{340 - 34}) f = (\frac{340}{306}) f$ &

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

$\frac{f_{1}}{f_{2}} = \frac{19}{18}$

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

⏱ 2mℹ️ Source: PYQ_2020

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