Home Physics Wave and Sound Mix A siren is fitted on a car going towards a v…
Physics Wave and Sound Mix MCQ (Single Correct)

A siren is fitted on a car going towards a vertical wall at a speed of 36 km/h. A person standing on the ground, behind the car, listens to the siren sound coming directly from the source as well as that coming after reflection from the wall. Calculate the apparent frequency of the wave

A
coming directly from the siren to the person and
B
coming after reflection. Take the speed of sound to be 340 m/s. Assume frequency of siren is 500 Hz.

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Velocity of source

Apparent frequency of the wave

531.25 Hz

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