Question
The work done by all the forces (external and internal) on a system equals the change in:
- Total energy.
- Kinetic energy.
- Potential energy.
- None of these.
Explanation:
The work done by all the forces (external and internal) on a system is equal to the change in the total energy.
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$(A)$ The average energy per mole of the gas mixture is $2RT$.
$(B)$ The ratio of speed of sound in the gas mixture to that in helium gas is $\sqrt{6 / 5}$.
$(C)$ The ratio of the rms speed of helium atoms to that of hydrogen molecules is $1 / 2$.
$(D)$ The ratio of the rms speed of helium atoms to that of hydrogen molecules is $1 / \sqrt{2}$.

