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A sound source producing waves of frequency 300 Hz and wavelength 1 m observer is stationary, while source is going away with the velocity $30 \mathrm{~m} / \mathrm{s}$, then apparent frequency heared by the observer is
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$273\mathrm{~Hz}$
Apparent frequency $n^{\prime}=n\left(\frac{v}{v+v_s}\right)$
$\begin{aligned} v & =\text { velocity of sound, } \\ v_s & =\text { velocity of source }\end{aligned}$
$\therefore \quad n^{\prime}=300\left(\frac{332}{332+30}\right)=273 \mathrm{~Hz}$
$\begin{aligned} v & =\text { velocity of sound, } \\ v_s & =\text { velocity of source }\end{aligned}$
$\therefore \quad n^{\prime}=300\left(\frac{332}{332+30}\right)=273 \mathrm{~Hz}$
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