When a sound wave of frequency $300 Hz$ passes through a medium the maximum displacement of a particle of the medium is $0.1 cm$. The maximum velocity of the particle is equal to
A$60\pi cm/sec$
B$30\pi cm/sec$
C$30 cm/sec$
D$60 cm/sec$
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A$60\pi cm/sec$
a (a) ${v_{\max }} = a\omega = a \times 2\pi n = 0.1 \times 2\pi \times 300 = 60\pi \,cm/\sec $
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