1.

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure .(##ARH_EGN_PRG_PHY_C17_E02_019_Q01.png" width="80%"> The change in internal energy of the gas during the transition is

Answer»

20kJ
`-20 kJ`
20 J
`-12 kJ`

SOLUTION :For a diatomic gas ,

The change in internal energy of gas in the transition from A to B is`Delta U=nC_(V)dT`
`= n ((5R)/(2))(T_(B)-T_(A))=nR(5)/(2)((p_(B)V_(B))/(nR)-(p_(A)V_(A))/(nR))`
=`(5)/(2)(2xx10^(3)xx6-5xx10^(3)xx4)`
= `(5)/(2)(-8xx10^(3))=-(4xx10^(4))/(2)=-20kJ`


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