Q. A source of sound is approaching an observer with speed of $30\ ms^{- 1}$ and the observer is approaching the source with a speed $60\ ms^{- 1}$. Then the fractional change in the frequency of sound in air $(330ms^{- 1})$ is
A) $\frac{1}{3}$
B) $\frac{3}{10}$
C) $\frac{2}{5}$
D) $\frac{2}{3}$
Explanation
The correct answer is Option B: $\frac{3}{10}$.
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.