A sound source emits frequency of \( 180 \mathrm{~Hz} \) when moving towards a rigid wall with s...

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A sound source emits frequency of \( 180 \mathrm{~Hz} \) when moving towards a rigid wall with speed \( 5 \mathrm{~m} / \mathrm{s} \) and an observer is moving away from wall with speed \( 5 \mathrm{~m} / \mathrm{s} \). Both source and observer moves on a straight line which is perpendicular to the wall. The number of beats per second heard by the observer will be [speed of sound \( =355 \mathrm{~m} / \mathrm{s} \) ]
(a) 5 beats/s
(b) 10 beats/s
(c) 6 beats/s
(d) 8 beats/s
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