Two persons \( A \) and \( B \), each carrying a source of frequency \( 300 \mathrm{~Hz} \), are...

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Two persons \( A \) and \( B \), each carrying a source of frequency \( 300 \mathrm{~Hz} \), are standing a few metre apart. \( A \) starts moving towards \( B \) with velocity \( 30 \mathrm{~m} / \mathrm{s} \). If the speed of sound is \( 300 \mathrm{~m} / \mathrm{s} \), which of the following is true?
(a) Number of beats heard by \( A \) is higher than that heard by \( B \)
(b) The number of beats heard by \( B \) are \( 30 \mathrm{~Hz} \)
(c) Both (a) and (b) are correct
(d) Both (a) and (b) are wrong
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