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A sound souorce is moving towards stationary listener with $\frac{1}{10}$ th of the speed of sound. The ratio of apparent to read frequency is
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$\left(\frac{10}{9}\right)$
$v_{\mathrm{s}}=\frac{\mathrm{v}}{10} \quad \mathrm{n}^{\prime}=\mathrm{n} \frac{\mathrm{v}}{\mathrm{v}-\mathrm{v}_{\mathrm{s}}}$
$\frac{\mathrm{n}^{\prime}}{\mathrm{n}}=\frac{\mathrm{v}}{\left(\mathrm{v}-\frac{\mathrm{v}}{10}\right)}=\frac{10}{9}$
$\frac{\mathrm{n}^{\prime}}{\mathrm{n}}=\frac{\mathrm{v}}{\left(\mathrm{v}-\frac{\mathrm{v}}{10}\right)}=\frac{10}{9}$
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