On the basis of kinetic theory of gases, the gas exerts pressure because its molecules: (a) continuously lose their energy till it reaches wall. (b) are attracted by the walls of container. (c) suffer change in momentum when impinge on the walls of container. (d) continuously stick to the walls of container.

Answer: (c). Molecules hit the wall and bounce back, so the momentum of each changes by 2mv. The wall supplies this change of momentum, so the molecules push back on the wall. Force per unit area is the pressure. So the answer is (c) they suffer change in momentum when they hit the walls.

On the basis of kinetic theory of gases, the gas exerts pressure… | JEE Main 2021 (24 Feb, Shift 2)

Q28JEE Main 2021 · 24 FEB · SHIFT 2Easy

Pressure & Kinetic Energy of a Gas

On the basis of kinetic theory of gases, the gas exerts pressure because its molecules:

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Answer: (c)

Molecules hit the wall and bounce back, so the momentum of each changes by $2mv$ .
The wall supplies this change of momentum, so the molecules push back on the wall. Force per unit area is the pressure.
So the answer is (c) they suffer change in momentum when they hit the walls.

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