Question
Question: A fast train moving at 40 m/s passes by a stationary observer, emitting a whistle of frequency 300 H...
A fast train moving at 40 m/s passes by a stationary observer, emitting a whistle of frequency 300 Hz. If the velocity of sound waves is 340 m/s, then the change in the apparent frequency of the sound, just before and just after the train passes by the observer, will be nearly –
A
32 Hz
B
40 Hz
C
72 Hz
D
8 Hz
Answer
72 Hz
Explanation
Solution
Do yourself.