wave_mechanics dopplers_effect Question 60
Question: A police car horn emits a sound at a frequency 240 Hz when the car is at rest. If the speed of the sound is 330 m/s, the frequency heard by an observer who is approaching the car at a speed of 11 m/s, is :
[UPSEAT 2004]
Options:
A) 248 Hz
B) 244 Hz
C) 240 Hz
D) 230 Hz
Show Answer
Answer:
Correct Answer: A
Solution:
Frequency heard by the observer $ {n}’=n( \frac{v+v _{0}}{v} )=240( \frac{330+11}{330} )=248Hz.
$
BETA
