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MHT CET Physics question

PhysicsWavesMHT CET

A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz while train approaches the siren. During his return journey in a different train d, he records a frequency of 6 kHz while approaching the same siren. The ratio of the velocity of train B to that of train A is

Answer: (B)

Solution

For an approaching observer : and

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Question ID VK-068609