The difference between the apparent frequency of a source of sound ...

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The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is \( 2 \% \) of the natural frequency of the source.
\( \mathrm{P} \) If the velocity of sound in air is \( 300 \mathrm{~m} / \mathrm{sec} \), the velocity of the W source is (It is given that velocity of source \( \) velocity of sound)
[CPMT 1982; RPET 1998]
(a) \( 6 \mathrm{~m} / \mathrm{sec} \)
(b) \( 3 \mathrm{~m} / \mathrm{sec} \)
(c) \( 1.5 \mathrm{~m} / \mathrm{sec} \)
(d) \( 12 \mathrm{~m} / \mathrm{sec} \)
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