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If at same temperature and pressure, the densities for two diatomic gases are respectively \( d_{1} \) and \( d_{2} \), then the ratio of velocities of sound in these gases will be
[CPMT 2001]
\( \mathrm{P} \)
(a) \( \sqrt{\frac{d_{2}}{d_{1}}} \)
(b) \( \sqrt{\frac{d_{1}}{d_{2}}} \)
(c) \( d_{1} d_{2} \)
(d) \( \sqrt{d_{1} d_{2}} \)
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