A) inelastic spheres
B) perfectly elastic rigid spheres
C) perfectly elastic non-rigid spheres
D) inelastic non-rigid spheres
Correct Answer: B
Solution :
According to kinetic theory of gases molecules of a gas are identical, rigid and very small in size. The volume of the molecules themselves is negligible compared to the volume occupied by the gas. The collision between two molecules is perfectly elastic that is, the kinetic energy remains conserved in collision. Hence, molecules behave like perfectly elastic rigid spheres.
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