Thermodynamics Question 304

Question: An ideal gas has temperatureT1 , at the initial state shown in the P- V diagram. The gas has a higher ternperature T2 at the final states a and b, which it can reach the paths shown. The change in entropy:

Options:

A) greatest in a

B) greatest in b

C) same in a and b

D) nothing can be said

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Qa=ΔU+0=ΔU and Qb=ΔU+PΔV

As Qb>Qa,

Change in entropy is greater in case [b].



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