question_answer

A siren placed at a railway platform is emitting sound of frequency\[5\text{ }kHz\]. A passenger sitting in a moving train A records a frequency of \[5.5\text{ }kHz,\] while the train approaches the siren. During his return journey in a different train, he records a frequency of \[6.0\text{ }kHz\]while approaching the same siren. What is the ratio of the velocity of train B to that of train A?

Answer:

2