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A siren placed at a railway platform is ...

A siren placed at a railway platform is emmitting 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 of `A` is

A

`242//252`

B

`2`

C

`5/6`

D

`11/6`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Using the formula `n' = n((v_(A) + v)/(v))`
`n' = n((v_(A) + v)/(v)) = (5.5)/(5)` and `(V_(B) +V)/(V) = (6)/(5) rArr (v_(B))/(v_(A)) = 2`
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