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Question

In the process ABC for an ideal mono-atomic gas, the temperature at states A and C are equal. The heat released in the process BC is Q. Then the work done in the process A to B is equal to ____. (AB is isobaric and BC is isochoric process)


  1. Q
  2. Q2
  3. 2Q3
  4. 3Q2


Solution

The correct option is C 2Q3
TA=TC
So the process AC is isothermal.
 ΔUAC=0 

As, UBC=Q and
UAC=UAB+UBC
UAB=Q

For, monatomic gas f=3
UAB=nf2RT=Q

WAB=nRT=2Qf=2Q3

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