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MHT CET 2022 Physics question

PhysicsWavesMHT CET 2022

A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is 11 : 9. If the speed of sound is 'V', the speed of the car is

Answer: (B)

Solution

Let the car's speed be . While approaching, the observer hears ; after passing (receding), . Ratio .

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Question ID VK-093929