MHT CET 2022 Physics question

According to the kinetic theory of gases, when two molecules of a gas collide with each other than

(A)kinetic energy is conserved but momentum is not conserved
(B)neither kinetic energy nor momentum is conserved
(C)both kinetic energy and momentum are conservedCorrect
(D)momentum is conserved but kinetic energy is not conserved

Answer: (C)

Solution

One of the assumptions of the kinetic theory of an ideal gas is that the molecular collisions (with each other and with the walls) are perfectly elastic. In every collision, whether elastic or not, the linear momentum of the colliding system is conserved because no external force

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Question ID VK-094098