wave_mechanics dopplers_effect Question 3
Question: The wavelength is 120 cm when the source is stationary. If the source is moving with relative velocity of 60 m/sec towards the observer, then the wavelength of the sound wave reaching to the observer will be (velocity of sound = 330 m/s)
Options:
A) 98 cm
B) 140 cm
C) 120 cm
D) 144 cm
Show Answer
Answer:
Correct Answer: A
Solution:
$ {n}’=n( \frac{v}{v-v _{s}} ) $
Therefore $ {\lambda }’=\lambda ( \frac{v-v _{S}}{v} ) $
Therefore $ {\lambda }’=120( \frac{330-60}{330} )=98cm.
$
BETA
