Question

Refer to figure. Let ∆U1 and ∆U2 be the changes in internal energy of the system in the process A and B. Then
(a) ∆U1 > ∆U2
(b) ∆U1 = ∆U2
(c) ∆U1 < ∆U2
(d) ∆U1 ≠ ∆U2.

Answer 1

Option B is correct

Explanation:

The system's internal energy is a State function, That is to say, it only depends on the original and the final point of the cycle and does not depend on the path taken. All the A and B processes have similar starting and stopping points. Therefore, in process A the change in internal energy is equal to the change in internal energy in process B. Accordingly,

$\Delta \mathrm{U}_{1}=\Delta \mathrm{U}_{2}=0$