Question

Let the mass and velocity of a molecule of a gas be m and v respectively. What will be the change in momentum of the molecule due to collision with the container?

Solution

rebounds with a velocity -v. Initial momentum of the molecule = mv. Final momentum after collision = – mv. From conservation of momentum, change in momentum = mv – (-mv) = 2mv. Therefore, as a result of the collision, the wall of the container gets a momentum 2mv.

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