Wave Mechanics Question 690
Question: A speeding motorcyclist sees trafic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speeds of sound is 343 m/s, the frequency of the honk as heard by him will be :
Options:
A) 1332 Hz
B) 1372 Hz
C) 1412Hz
D) 1464Hz
Show Answer
Answer:
Correct Answer: C
Solution:
[c] According to Doppler’s effect Apparent frequency $ n’=n( \frac{v+v _{0}}{v+v _{s}} )=1392( \frac{343+10}{343+5} ) $
$ =1412,Hz $
BETA
