$A$ sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from $300\, K$ to $600\, K,$ the average kinetic energy $(K.E.)$ of helium atoms is

  • A
    Halved
  • B
    Unchanged
  • C
    Doubled
  • D
    Increased by factor $\sqrt{2}$

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