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In kinetic theory of gases, a molecules of mass ‘m’ of an ideal gas, collide with a wall of vessel with velocity ‘v’. The change in the linear momentum of the molecule is

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2 mv

-mv

zero

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detailed solution

Correct option is A

Δp→=pfinal−p¯lnitial ;Δp→=change in momentum; pfinal=final momentum;p¯lnitial=initial momentum;m=mass;v=velocity ΔP→=P¯f−P¯l=m(−v)−mv=−2mv if initial velocity=v; fina velocity =-v; negative since opposite in direction to v |ΔP|=2mv

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