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If the ratio of specific heat of a gas at constant pressure to that at constant volume is y, the change in internal energy

If the ratio of specific heat of a gas at constant pressure to that at constant volume is y, the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure P, is R (a) (y-1) (b) PV PV (c). (d) (y-1) YPV (y-1)

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