The root mean square speed of hydrogen molecules at $300$ $K$ is $1930\, m/s.$ Then the root mean square speed of oxygen molecules at $900\, K$ will be ....... $m/s$
  • A$1930\sqrt 3$
  • B$836$
  • C$643$
  • D$\frac{{1930}}{{\sqrt 3 }}$
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