Wave Mechanics Question 691
Question: An observer moves towards a stationary source of sound with a speed 1/8th of the speed of sound. The wavelength and frequency of the sound emitted are $ \lambda $ and $ f $ respectively. The apparent frequency and wavelength recorded by the observer are respectively.
Options:
A) $ 0.4f, 0.4\lambda $
B) $ 0.6f,1.6\lambda $
C) $ 1.4f,\lambda $
D) $ 1.1f,\lambda $
Show Answer
Answer:
Correct Answer: D
Solution:
$ f _{apparent}=( \frac{u+v/5}{u} )f=\frac{6}{5}f=1.2f $ Wavelength remains constant (unchanged) in this case.
BETA
