Q. An observer is moving towards the stationary source of sound, then
A) Apparent frequency will be less than the real frequency
B) Apparent frequency will be greater than the real frequency
C) Apparent frequency will be equal to real frequency
D) Only the quality of sound will charge
Explanation
(b) Apparent frequency in this case $n^{'} = \frac{n(v + v_{o})}{v}$
$\because\frac{v + v_{o}}{v} > 1 \Rightarrow \frac{n^{'}}{n} > i.e.\ n^{'} > n$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.