wave_mechanics dopplers_effect Question 19
Question: Suppose that the speed of sound in air at a given temperature is 400 m/sec. An engine blows a whistle at 1200 Hz frequency. It is approaching an observer at the speed of 100 m/sec. What is the apparent frequency as heard by the observer
[CPMT 1983; DPMT 2001]
Options:
A) 600 Hz
B) 1200 Hz
C) 1500 Hz
D) 1600 Hz
Show Answer
Answer:
Correct Answer: D
Solution:
$ n’=n( \frac{v}{v-v _{S}} )=1200( \frac{400}{400-100} )=1600Hz $
BETA
