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MHT CET 2022 Physics question

PhysicsWavesMHT CET 2022

An engine sounding a whistle of frequency 1152 Hz is receding from a stationary observer at 72 km/hour. If velocity of sound in air is 340 m/s, then the frequency of note heard by the observer is

Answer: (B)

Solution

Source speed m/s. For a receding source and stationary observer,

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Question ID VK-095731