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A monoatomic gas is expanded adiabatically to n times its initial volume. The ratio of final rate of collision of molecules with unit area of container walls to the initial rate will be 

a
n−43
b
n43
c
n23
d
n−53

detailed solution

Correct option is D

The rate of collision of molecules with unit area of walls of container is proportional to pressure.Now,   P1V1γ  =  P2V2γ   ⇒P2P1=V1V2γ For mono atomic gas  γ=1+23=53∴P2P1=V1nV153=n−53

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