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Helium atom is two times heavier than a ...

Helium atom is two times heavier than a hydrogen molecule. At 289 K, the average kinetic energy of a helium atom is

A

two times that of hydrogen molecule.

B

same as that of a hydrogen molecule.

C

four times that of a hydrogen molecule.

D

half that of a hydrogen molecule.

Text Solution

Verified by Experts

The correct Answer is:
B
The average kinetic energy of an atom is given as `(3)/(2)`kT . It does not depend on mass of the atom.
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Knowledge Check

  • A sealed container with negligible thermal cofficient of expansion contains helium (a monatomic gas). When it is heated from 300 to 600 K, the average kinetic energy of the helium atom is

    A
    halved
    B
    left unchanged
    C
    doubled
    D
    become `sqrt(2)` times
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