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The root mean square velocity of the molecules in a sample of helium is $(5/7)^{th}$ that of the molecules in a sample of hydrogen. If the temperature of hydrogen sample is $0°C,$ then the temperature of the helium sample is about
  • A$0°C$
  • B$0 \,K$
  • C$273°C$
  • D$100°C$
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