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MHT CET 2022 Physics question

PhysicsWavesMHT CET 2022

The pitch of the whistle of an engine appears to drop by 20% of original value when it passes a stationary observer. If speed of sound in air is 350 m/s then speed of engine in m/s is

Answer: (D)

Solution

After passing the observer the engine is receding, so the apparent frequency is . A drop of 20% means . Hence $ = 0.8 ⇒ v + = 1.25v ⇒ = 0.25v = 0.25×350 =

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Question ID VK-093636