The value of densities of two diatomic gases at constant temperature and pressure are ${\mathrm{d}}_{1}$ and  then the ratio of speed of sound in these gases will be

1. ${\mathrm{d}}_{1}{\mathrm{d}}_{2}$

2. $\sqrt{{\mathrm{d}}_{2}/{\mathrm{d}}_{1}}$

3. $\sqrt{{\mathrm{d}}_{1}/{\mathrm{d}}_{2}}$

4. $\sqrt{{\mathrm{d}}_{1}{\mathrm{d}}_{2}}$

2. Speed of sound in gases is given by

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