Q. A source and listener are both moving towards each other with speed $\frac{v}{10},$ where $v$ is the speed of sound. If the frequency of the note emitted by the source is $f,$ the frequency heard by the listener would be nearly
A) $1.11\ f$
B) $1.22\ f$
C) $f$
D) $1.27\ f$
Explanation
(b) When source and listener both are moving towards each other then, the frequency heard
[image:15_image85.png]
$n^{''}n = \left( \frac{v + v_{O}}{v - v_{S}} \right) \Rightarrow n^{''} = f\left( \frac{v + v/10}{v - v/10} \right) = 1.22\ f$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.