Question 6. A siren placed at a railway platfrom 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 (a) 242 / 252 (b) 2 (c) 5 / 6 (d) 11 / 6 Answer
Correct option is C) Original frequency of the siren f o =5 kHz Let the speed of train A and B be V A and V B , respectively. Doppler effect when an observer moves towards the stationary source : Apparent frequency heard f=??
