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50. We consider a thermodynamic system. If  ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true

(a) ΔU=-W  in an adiabatic process

(b) ΔU=W  in an isothermal process

(c) ΔU=-W  in an isothermal process

(d) ΔU=W  in an adiabatic process

Answer-a

(2)

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