Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram . Consider the following statements
I. Area ABCD = Work done on the gas
II. Area ABCD = Net heat absorbed
III. Change in the internal energy in cycle = 0
Which of these are correct ?
(1) I only
(2) II only
(3) II and III
(4) I, II and III
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(3) Work done by the gas (as cyclic process is clockwise) ∴ ΔW = Area ABCD
So from the first law of thermodynamics ΔQ (net heat absorbed) = ΔW = Area ABCD
As change in internal energy in cycle ΔU = 0.