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A thermodynamical process is shown in the figure with
\( p_{A}=3 \times p_{\text {atm }}, V_{A}=2 \times 10^{-4} \mathrm{~m}^{3}, p_{B}=8 \times p_{\text {atm }}, V_{C}=5 \times 10^{-4} \mathrm{~m}^{3} . p_{B} \)
In the process \( A B \) and \( B C, 600 \mathrm{~J} \) and \( 200 \mathrm{~J} \) heat are added to the
system. Find the change in internal energy of the system in the
process \( C A \). \( \left[1 p_{\text {atm }}=10^{5} \mathrm{~N} / \mathrm{m}^{2}\right] \)
\( \begin{array}{ll}\text { (a) } 560 \mathrm{~J} & \text { (b) }-560 \mathrm{~J} \\ \text { (c) }-240 \mathrm{~J} & \text { (d) }+240 \mathrm{~J}\end{array} \)
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