The number of compressions and rarefactions which pass an observer ...

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The number of compressions and rarefactions which pass an observer in 5 minutes, if the velocity of sound wave is \( 330 \mathrm{~m} / \mathrm{s} \) and the wavelength of the
\( \mathrm{D} \) wave is \( 30 \mathrm{~cm} \), is
(1) 3300
(2) \( 3.3 \times 10^{4} \)
(3) \( 3.3 \times 10^{5} \)
(4) \( 3.3 \times 10^{2} \)
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