The ratio of velocity of sound in hydrogen and oxygen at STP is :

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The correct answer is:

4 : 1

The velocity of sound

v = \sqrt{\frac{γ RT}{M}}

v \propto \frac{1}{\sqrt{M}}

\frac{v_{H}}{v_{o}} = \sqrt{\frac{M_{o}}{M_{H}}}

= \sqrt{\frac{16}{1}}

= 4 : 1

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