First slide

Kinetic theory of ideal gases

Question

A sealed container with a negligible linear coefficient of thermal expansion contains Helium. When heated from 300 K to 600 K, the average kinetic energy of Helium atom is

Moderate

A

halved
B

left unchanged
C

doubled
D

increased by a factor of $\sqrt{2}$

Solution

The average kinetic energy per molecule of a gas is $\frac{3}{2} k T α T$
If temperature is doubled then average kinetic energy also doubles

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