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Q.

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 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 of velocity of train B to that of train A is

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a

242252

b

2

c

56

d

116

answer is B.

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Detailed Solution

51+VAV=5.5       and

51+VBV=6

∴VA=V10        and   

∴VB=V5

∴VBVA=2

 

 

 

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