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5. 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 and L2 are the lengths of the gas column before and after expansion respectively, then T1/T2 is given by

(a)     ( L1/L2)2/3                       (b) L1/L2

(c)   L2 /L1                                 (d) (  L2 /L1 )2/3

Ans. d

(19)

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