Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion, the average time of collision between molecules increases as 
, where 
is the volume of the gas. The value of 
is 
Text Solution
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We know that, average time of collision between molecules,
where, 
number of molecules per unit volume and 
rms velocity of molecules.
Thus, we can write 
and 
where, 
and 
are constants.
For adiabatic process, 
constant
Thus, we can write
As, given the average time of collision between molecules increases as 
, so on comparing, we get
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