A sound source is moving towards a stationary observer with $(1/10)$ of the speed of sound. The ratio of apparent to real frequency is .........
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(a)
$f=f_0 \frac{v}{v-v_s}$
$f=f_0 \frac{v}{v-v / 10}$
$f=\frac{10 f_0}{9}$
$\therefore f: f_0=\frac{10}{9}$
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