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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Kinetic Theory of Gases
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A container contains an ideal gas. The wall is hit by "n" molecules / second, each of mass "m" and moving the same velocity "u". The force exerted by the molecules on the wall is?

(A) 0 (B) 1 $mnu$ (C) 0.5 $mnu$ (D) 2 $mnu$
Can you answer this question?
 
 

1 Answer

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Total mass of molecules striking per second = $mn$.
Momentum with which the molecules strike = $mnu$
Momentum after striking = $-mnu$
Momentum change per second = $mnu - (-mnu) = 2 mnu$
answered Jan 31, 2014 by balaji
edited Aug 9, 2014 by balaji.thirumalai
 

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