RMS}}=\sqrt{\frac{3RT}{M}}\]Þ \[{{V}_{rms}}=\sqrt{T}\] GIVEN \[{{V}_{1}}=V\], \[{{T}_{1}}=300K\], \[{{V}_{2}}=2V\], \[{{T}_{2}}=?\] \[\frac{{{V}_{1}}}{{{V}_{2}}}=\sqrt{\frac{{{T}_{1}}}{{{T}_{2}}}}\]; \[{{\left( \frac{V}{2V} \right)}^{2}}=\frac{300}{{{T}_{2}}}\] Þ \[{{T}_{2}}=300\times 4=1200K\]