Which is the correct statement ?
(1) For an isothermal change PV = constant
(2) In an isothermal process the change in internal energy must be equal to the work done
(3) For an adiabatic change , where γ is the ratio of specific heats
(4) In an adiabatic process work done must be equal to the heat entering the system
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(1) Since PV = RT and T = constant;
∴ PV = constant.