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A siren placed at a railway platform is ...

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 `5.5kHz` while the train approaches the siren. During his return journey in a different train `B` he records a frequency of `6.0 kHz` while approaching the same siren. the ratio the velocity of train `B` to that of train `A` is

A

242//252

B

2

C

4

D

6

Text Solution

Verified by Experts

The correct Answer is:
B
`(V_(A)+V)/(V)=(5.5)/(5)`
`(V_(B)+V)/(V)=(6)/(5)`
Solve to get `(V_(B))/(V_(A)) =2`.
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