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28. In an adiabatic expansion of a gas initial and final temperatures

are T1 and T2 respectively, then the change in internal energy of the gas is

(a)    (R/ϒ-1) (T2-T1)                 (b) (R/ϒ-1) (T1-T2)

(c)     R(T1-T2)                            (d)  Zero

Ans. a

(13)

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