Question

A sound source is performing a uniform circular motion with speed $v_0$ and radius $r$. An observer is at point $A$ $(r<<OA)$ as shown in the figure. The apparent frequency heard by the observer is maximum and minimum at respectively points

• A. $P$ and $R$
• B. $R$ and $P$
• C. $S$ and $Q$
• D. $Q$ and $S$

Answer 1

The correct option is B $R$ and $P$


At R, source approaches the observer while at P it recedes from the observer. At other points velocity of sound and source are perpendicular.
Thus maximum frequency will be observed at R while minimum at P.