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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

`5//6`

D

`11/6`

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ERRORLESS -WAVES AND SOUND-Doppler s Effect
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