A monoatomic ideal gas, initially at temperature T1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. If L1,L2 are the lengths of the gas column before and after expansion respectively, then T1/T2 is given by :
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a
(L1/L2)2/3
b
L2/L1
c
L1/L2
d
(L2/L1)2/3
answer is D.
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Detailed Solution
In adiabatic process, relation between temperature T and Volume V is TVγ-1=constant, here γ is specific heat ratio⇒T1V1γ-1=T2V2γ-1⇒T1T2=V2V1γ−1volume V= Area of base x height given V1=AL1V2=AL2, for monoatomic gas γ=53⇒T1T2=AL2AL15/3−1⇒T1T2=L2L12/3