Two monoatomic ideal gases $1$ and $2$ of molecular masses $m_1$ and $m_2$ respectively are enclosed in separate containers kept at the same temperature. The ratio of the speed of sound in gas $1$ to that in gas $2$ is given by
IIT 2000, Easy
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(b) Speed of sound in gases is given by
$v = \sqrt {\frac{{\gamma RT}}{M}} \Rightarrow v \propto \frac{1}{{\sqrt M }}$
==> $\frac{{{v_1}}}{{{v_2}}} = \sqrt {\frac{{{m_2}}}{{{m_1}}}} $
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