A source emitting sound of frequency $f_0$ is moving in a circle of radius $R$, having centre at the origin,-with a uniform speed is $\frac{c}{3}$ where c is the speed of sound. Find the maximum and minimum frequencies heard by stationary listener at the point $(\frac{R}{2},0)$

Consider the following statements about sound passing through a gas.

$\left(\mathrm{A}\right)$ The pressure of the gas at a point oscillates in time.

$\left(\mathrm{B}\right)$ The position of a small layer of the gas oscillates in time.

A source and an observer are situated on two perpendicular tracks as shown in the figure. The observer is at rest and the source is moving with a speed of $50 \mathrm{m} {\mathrm{s}}^{-1}$. The source emits a sound wave of frequency $75 \mathrm{Hz}$, which travel in the medium with a velocity of $200 \mathrm{m} {\mathrm{s}}^{-1}$. The frequency of the sound heard by the observer when the source crosses the origin

A source that is the emitting sound of frequency $f$ is initially at $\left(–r, 0\right)$ and an observer is situated initially at $\left(2r, 0\right)$. If observer and source both are moving with velocities $v_{\mathrm{observer}}=-\sqrt{2}V\hat{\mathrm{i}}-\sqrt{2}V\hat{\mathrm{j}}$ and $v_{source}=\frac{V}{\sqrt{2}}\hat{\mathrm{i}}+\frac{V}{\sqrt{2}}\hat{\mathrm{j}}$, then which of the following is the correct option?