wave_mechanics dopplers_effect Question 18
Question: The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity 50 m/s. The apparent frequency in cps heard by the observer will be
[CPMT 1976; RPET 1999; BHU 1997, 2001]
Options:
A) 600
B) 1050
C) 1400
D) 2400
Show Answer
Answer:
Correct Answer: C
Solution:
$ n’=n( \frac{v}{v-v _{s}} )=1200\times ( \frac{350}{350-50} ) $ =1400 cps
BETA
