A gas undergoes a change of state during which 100 J of heat is supplied to it and it does 20 J of w

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11.Thermodynamics

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A gas undergoes a change of state during which $100 J$ of heat is supplied to it and it does $20 J$ of work. The system is brought back to its original state through a process during which $20 J$ of heat is released by the gas. The work done by the gas in the second process is ....... $J$

A

$60 $

B

$40 $

C

$80 $

D

$20 $

Solution

(a) In a cyclic process $\Delta U = 0$==> $\Delta Q = \Delta W$

==> $(100 – 20) = 20 + {W_2}$ ==> ${W_2} = 60\,J$

Standard 11

Physics

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