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) $n' = n\,\left( {\frac{v}{{v - {v_S}}}} \right) = n\,\left( {\frac{v}{{v - v/10}}} \right)\,$
==> $\frac{{n'}}{n} = \frac{{10}}{9}$
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