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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectEasy2 minPYQ_2020

PhysicsEasysingle choice

A siren emitting a sound of frequency $800 Hz$ moves away from an observer towards a cliff at a speed of $15 m s^{- 1}$ . Then, the frequency of sound that the observer hears in the echo reflected from the cliff is
(Take velocity of sound in air $= 330 m s^{- 1}$ )

Options:

Answer:

Solution:

Given

$f_{ο} = 800 H z$
$V_{s o u r c e} = 15 m s^{- 1}$

$f_{a} = f_{0} (\frac{V + V_{0}}{V - V_{s}})$

$\Rightarrow f_{a} = \frac{330}{(330 - 15)} \times 800 = \frac{330}{315} \times 800$

$f_{a} = 838 H z$

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

⏱ 2mℹ️ Source: PYQ_2020

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