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The ratio of the speed of sound to the average speed of an air molecule at $300 \mathrm{~K}$ and 1 atmospheric pressure is close to-
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$\frac{\mathrm{V}_{\text {sound }}}{\mathrm{V}_{\mathrm{av}}}=\sqrt{\frac{\gamma \mathrm{kT}}{\mathrm{m}} \times \frac{\pi \mathrm{M}}{8 \mathrm{kT}}}$
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