A siren placed at a railwary platform is emitting sound of frequency 5 k Hz. A passenger sitting in a moving train approaches the siren. During his return journey in a different train B, he records a frequency of 6.0 K Hz. While approaching the same siren. The ratio of velocity of train B to the velocity of train A is :

Options

A. 242/252
B. 43957
C. 2
D. 44141

Answer

C

Explanation

v.` = ((V + U_(0))/(V) ) v rArr 5.5 = ((V + v_(1))5)/(v) `
`v_(1) = 0.1` v
In second case, 6 = `((V + v_(2))/(v) ) 5 rArr v_(2) = 0.2 `v
`therefore (v_(2))/(v_(1)) = 2 `. Correct choice is (c).