wave_mechanics dopplers_effect Question 7
Question: An observer moves towards a stationary source of sound of frequency n. The apparent frequency heard by him is 2n. If the velocity of sound in air is 332 m/sec, then the velocity of the observer is
[MP PET 1990]
Options:
A) 166 m/sec
B) 664 m/sec
C) 332 m/sec
D) 1328 m/sec
Show Answer
Answer:
Correct Answer: C
Solution:
$ n’=n( \frac{v+v _{O}}{v} )\Rightarrow 2n=n( \frac{v+v _{0}}{v} )\Rightarrow \frac{v+v _{0}}{v}=2 $
$ \Rightarrow $ $ v _{O}=v=332 $ m/sec
BETA
