Shown in the figure are the Pressure versus Volume graphs for two processes, in each case state of a system is changed from A to B along the straight lines shown. In which case, will the heat added to

Question

Shown in the figure are the Pressure versus Volume graphs for two processes, in each case state of a system is changed from A to B along the straight lines shown. In which case, will the heat added to the system be more?

TestHub · Accepted Answer

Work (area under the straight line) is the same in both cases: 2 1 ​ ( 2 + 4 ) ( 9 − 3 ) = 18 atm ⋅ m 3 . Δ ( P V ) : Case I: 9 × 4 − 3 × 2 = 30 ; Case II: 9 × 2 − 3 × 4 = 6 . Case I has larger Δ T , hence larger Δ U and more heat added.

Physics - Heat & Thermo Question with Solution | TestHub

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