Answer:
\[\frac{{{({{\upsilon }_{rms}})}_{1}}}{{{({{\upsilon }_{rms}})}_{2}}}=\sqrt{\frac{{{M}_{2}}}{{{M}_{1}}}}\] \[=\sqrt{\frac{{{\rho }_{2}}}{{{\rho }_{1}}}}=\sqrt{\frac{9}{8}}=\mathbf{3:2}\sqrt{\mathbf{2}}\mathbf{.}\]
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