Let v_s be the speed of the source emitting waves, n the actual frequency of the source of sound, V the speed of the sound in the medium and n' the frequency of sound waves as perceived by a stationary observer to whom the source of sound is approaching. The formula for calculate for n' is

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$n^{'} = \frac{n}{(1 - \frac{v_{s}}{v})}$

$n^{'} = \frac{n}{(1 + \frac{v_{s}}{v})}$

n' = n

$n^{'} = n (1 - \frac{v_{S}}{v})$

answer is B.

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Detailed Solution

When source approaches the observer, then apparent frequency is
$n^{1} = n (\frac{v}{v - v_{s}}) = \frac{n}{1 - \frac{v_{s}}{v}}$

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