defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Physics Waves Doppler effect
A siren placed at a railway platform is the emitting a 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 the velocity of train B to that of train A is:
1
242 / 252
2
2
3
5 / 6
4
None of these