NEETPhysicsThermodynamics
Following figure shows two processes A and B for a gas. If ∆ Q A and ∆ Q B are the amount of heat absorbed by the system in two cases, and ∆ U A and ∆ U B are changes in internal energies, respectively, then:
Options
- A∆ Q A < ∆ Q B ; ∆ U A < ∆ U B
- B∆ Q A = ∆ Q B ; ∆ U A = ∆ U B
- C∆ Q A > ∆ Q B ; ∆ U A = ∆ U B
- D∆ Q A > ∆ Q B ; ∆ U A > ∆ U B
Correct answer
C. ∆ Q A > ∆ Q B ; ∆ U A = ∆ U B
Step-by-step solution
⇒ ∆ U A = ∆ U B as change in internal energy depends on initial and final state and not the path. ⇒ By comparing area under the curve, W A > W B From Q = U + W We can say, Q P A > Q P B