Thermodynamics Question 304
Question: An ideal gas has temperature$ T _{1} $ , at the initial state shown in the P- V diagram. The gas has a higher ternperature $ T _{2} $ 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] $ Q _{a}=\Delta U+0=\Delta U\text{ and }Q _{b}=\Delta U+P\Delta V $
$ \text{As }Q _{b}>Q _{a}, $
$ \therefore $ Change in entropy is greater in case [b].
