Q. A source and an observer are moving towards each other with a speed equal to $\frac{v}{2}$ where $v$ is the speed of sound. The source is emitting sound of frequency $n.$ The frequency heard by the observer will be

A) Zero
B) $n$
C) $\frac{n}{3}$
D) $3n$
Explanation

(d) $n^{'} = n\left( \frac{v + v_{o}}{v - v_{s}} \right) = n\left( \frac{v + v/2}{v - v/2} \right) = 3n$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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