38. If the ratio of specific heat of a gas at constant pressure
to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is
(a) R/( γ – 1) (b) pV
(c) pV/ ( γ – 1) (d) γpV/ ( γ – 1)
Ans. c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a