The $r.m.s.$ speed of the molecules of a gas at a pressure ${10^5}$ $Pa$ and temperature $0^\circ C$ is $0.5km\;{\sec ^{ - 1}}.$ If the pressure is kept constant but temperature is raised to $819°C,$ the velocity will become ........ $km\,sec^{-1}$
  • A$1.5$
  • B$2$
  • C$5$
  • D$1$
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