A point source of sound \( S \) of natural frequency \( 256 \mathrm{~Hz} \) and a receiver \( R ...

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A point source of sound \( S \) of natural frequency \( 256 \mathrm{~Hz} \) and a receiver \( R \) are moving along same line with speed \( u=10 \mathrm{~m} / \mathrm{s} \), towards a reflecting surface which is approaching them with speed \( u \) as shown in figure.

If speed of sound in air is \( 330 \mathrm{~m} / \mathrm{s} \), then the frequency of reflected wave received by \( R \) are respectively
(a) \( 270 \mathrm{~Hz} \)
(b) \( 289 \mathrm{~Hz} \)
(c) \( 274 \mathrm{~Hz} \)
(d) \( 254 \mathrm{~Hz} \)
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