Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectHard2 minPYQ_2020

PhysicsHardsingle choice

A table is revolving on its axis at $5$ revolutions per second. A sound source of frequency $1000 Hz$ is fixed on the table at $70 cm$ from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound = $352 m s^{- 1}$ )

Options:

Answer:

Solution:

$v_{s} = r ω = r \times 2 π v$

$= \frac{70}{100} \times 2 \times \frac{22}{7} \times 5 = 22 m s^{- 1}$

Frequency is minimum when the source is moving away from the listener.

$ν^{'} = \frac{u \times ν}{u + v_{s}} = \frac{352 \times 1000}{352 + 22} = 941 H z$

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

⏱ 2mℹ️ Source: PYQ_2020

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