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A siren placed at a railway platform is ...

A siren placed at a railway platform is emitting a sound of frequency 5 kHz. A passenger sitting in a moving train ‘A’ records the frequency of the siren as 5.5 kHz. During his return journey by train ‘B’ he records the frequency of the siren as 6 kHz. The ratio of the speed of train B to that of train A is

A

`frac(242)(252)`

B

2

C

`frac(5)(6)`

D

`frac(11)(6)`

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TARGET PUBLICATION-Sound-Exercise
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