First slide

First law of thermodynamics

Question

Starting with the same initial conditions, al ideal gas expands from volume V₁ to V₂ in three different ways. The work done by the gas is W₂ if the process is purely isothermal, W₂ if purely isobaric and W₃ if purely adiabatic. Then

Moderate

A

$W_{2} > W_{1} > W_{3}$
B

$W_{2} > W_{3} > W_{1}$
C

$W_{1} > W_{2} > W_{3}$
D

$W_{1} > W_{3} > W_{2}$

Solution

Work done is equal to area under the curve on PV diagram.

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