(4) 700 J
\(Q = P\delta V +_nC_v \Delta T\)
\(=P\Delta V + n \frac {R}{(\gamma -1)}\Delta T\)
\(= P\Delta V + \frac {P\Delta V}{\gamma -1}\)
\(= P\Delta V \left(1 + \frac {1}{\gamma - 1}\right)\)
\(=200 \left(1 + \frac {1}{0.4}\right)\)
= 200 x 3.5
= 700 J
