wave_mechanics dopplers_effect Question 13

Question: A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is

[MP PMT 1990]

Options:

A) 50 Hz

B) 100 Hz

C) 150 Hz

D) 200 Hz

Show Answer

Answer:

Correct Answer: D

Solution:

Since there is no relative motion between observer and source, therefore there is no apparent change in frequency.