When do formulas for adiabatic processes apply?

  • #1
Homework Statement
Please see the attached photo
Relevant Equations
Change in internal energy = nCvT
Screenshot 2021-03-14 at 4.29.36 PM.png


In this problem, the method used to solve the question is to equate pdV with change in internal energy. This implies an adiabatic process as Q = 0? (not sure about this claim) However, why is it not correct to simply apply the PV^ϒ = constant formula?

Thank you.
 
  • #2
why is it not correct to simply apply the PV^ϒ = constant formula?
What would you apply that to? You cannot apply it to the system as a whole since there are two initial pressures. You cannot apply it to one partition since there is heat flow between them.
 
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