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One mole of a diatomic ideal gas undergo...

One mole of a diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiabatic. The temperature at A,B and C are 400K, 800K and 600K respectively. Choose the correct statement:

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Process `ArarrB`
`DeltaU=nC_(v)DeltaT=1xx(5R)/(2)(800-400)=1000R`
`CrarrA,DeltaU=nC_(v)DeltaT=1xx(5R)/(2)(400-600)=-500R`
`DeltaU_("cycle")=0,` and `DeltaU_(AB)+DeltaU_(BC)+DeltaU_(CA)=0`
`1000R+DeltaU_(BC)-500R=0, therefore DeltaU_(BC)=-500R`
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