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: A. change in internal energy in the process AB `=350R`B. change in internal energy in the process BC is `-500R`C. change in internal energy in the whole cyclic process is `250R`D. change in internal energy in the process CA is `700R`

One mole of a diatomic ideal gas undergoes a cyclic process ABC as sho

1.	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: A. change in internal energy in the process AB `=350R`B. change in internal energy in the process BC is `-500R`C. change in internal energy in the whole cyclic process is `250R`D. change in internal energy in the process CA is `700R`
Answer» Correct Answer - B `DeltaU_(AB)=nC_(v)(T_(B)-T_(A))` `=1xx(5R)/2(800-400)=1000R` `DeltaU_(BC)= n C_(v)(T_(c)-T_(B))` `= 1xx(5R)/2(600-800)= -500R` `DeltaU_(total)=0 ( :. "Process is cyclic")` `DeltaU_(CA)= n C_(v)(T_(A)-T_(C))` `= 1xx(5R)/2(400-600)= -500R`

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