First slide

Heat ;work and internal energy

Question

The initial pressure and volume of a gas are $P_{i} a n d V_{i}$ . The gas after expansion attains final volume $V_{f}$ . Let $W_{1}, W_{2} a n d W_{3}$ are the corresponding work done by the gas, under isothermal, adiabatic and isobaric process, respectively. Then,

Easy

A

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

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

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

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

Solution

$W_{3} > W_{1} > W_{2}$ $∵ W α$ Area under P-V graph

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