Q. The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are $v,v_{s}$ and $v_{o},$ then the apparent frequency heard by the observer will be ($n =$ frequency of sound)
A) $\frac{n(v + v_{o})}{v - v_{o}}$
B) $\frac{n(v - v_{o})}{v - v_{s}}$
C) $\frac{n(v - v_{o})}{v + v_{s}}$
D) $\frac{n(v + v_{o})}{v + v_{s}}$
Explanation
The correct answer is Option B: $\frac{n(v - v_{o})}{v - v_{s}}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.