RMS speed – dependence on temperature

2016 1 question

1. 1 Kinetic Theory
   The molecules of a given mass of a gas have r.m.s velocity of 200 $ms^{-1}$ at 27°C and $1.0 \times 10^{5}\ Nm^{-2}$ pressure. When the temperature and pressure of the gas are respectively, 127 °C and $0.05 \times 10^{5}\ Nm^{-2}$, the rms velocity of its molecules in $ms^{-1}$ is
   A $\frac{400}{\sqrt{3}}$ B $\frac{100\sqrt{2}}{3}$ C $\frac{100}{3}$ D $100\sqrt{2}$
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