Statement -1: Due to the motion of the listen | vedclass

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Question

(C) The general formula for the Doppler effect is $f^{\prime} = f \left( \frac{V \pm V_o}{V \pm V_s} \right)$,where $V$ is the speed of sound,$V_o$ is

Vedclass · Accepted Answer

Only Statements $-1$ and $-2$ are correct

Vedclass · Answer

(C) The general formula for the Doppler effect is $f^{\prime} = f \left( \frac{V \pm V_o}{V \pm V_s} ight)$,where $V$ is the speed of sound,$V_o$ is the velocity of the observer (listener),and $V_s$ is the velocity of the source.Statement $-1$: When the source is stationary $(V_s = 0)$,the frequency received is $f^{\prime} = f \left( \frac{V \pm V_o}{V} ight)$. Since $f^{\prime} 
eq f$ (if $V_o 
eq 0$),the frequency is affected. Thus,Statement $-1$ is correct.Statement $-2$: When the source moves,the wavelength $\lambda$ changes to $\lambda^{\prime} = \frac{V \pm V_s}{f}$. Thus,the wavelength is affected. Statement $-2$ is correct.Statement $-3$: If both the source and listener are moving such that their velocities are equal $(\vec{V}_s = \vec{V}_o)$,then $f^{\prime} = f \left( \frac{V \pm V_o}{V \pm V_o} ight) = f$. In this case,the observed frequency is equal to the original frequency. Thus,Statement $-3$ is incorrect.Therefore,only Statements $-1$ and $-2$ are correct.

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