A gas is expanded from volume V 0 to 2 V 0 under three different processes. Process 1 is isobaric, process 2 is isothermal and process 3 is adiabatic. Let Δ U 1 , Δ U 2 and Δ U 3 be the chan

Question

A gas is expanded from volume V 0 ​ to 2 V 0 ​ under three different processes. Process 1 is isobaric, process 2 is isothermal and process 3 is adiabatic. Let Δ U 1 ​ , Δ U 2 ​ and Δ U 3 ​ be the change in internal energy of the gas in these processes. Then:

TestHub · Accepted Answer

Δ U ∝ Δ T . The final temperature is highest in process 1, then process 2 (unchanged), then process 3 (adiabatic expansion cools). So Δ U 1 ​ > Δ U 2 ​ > Δ U 3 ​ . A.

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