Q. 4

Refer to figure. Let ΔU1 and ΔU2 be the change in internal energy in processes A and B respectively, ΔQ be the net heat given to the system in process A + B and ΔW be the net work done by the system in the process A + B.

A. ΔU1 + ΔU2 = 0

B. ΔU1 – ΔU2 = 0

C. ΔQ – ΔW = 0

D. ΔQ + ΔW = 0

Answer :

As seen from the figure initial state of A is the final state of B and vice-versa.

So, the change in internal energy of process A and B will be equal in magnitude but with a negative sign.

So ΔU1=-ΔU2


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