wave_mechanics dopplers_effect Question 11
Question: Two passenger trains moving with a speed of 108 km/hour cross each other. One of them blows a whistle whose frequency is 750 Hz. If sound speed is 330 m/s, then passengers sitting in the other train, after trains cross each other will hear sound whose frequency will be
[MP PMT 1991]
Options:
A) 900 Hz
B) 625 Hz
C) 750 Hz
D) 800 Hz
Show Answer
Answer:
Correct Answer: B
Solution:
$ n’=n( \frac{v-v _{o}}{v+v _{s}} )=750( \frac{330-180\times \frac{5}{18}}{330+108\times \frac{5}{18}} )=625 $
$ Hz $
BETA
