question_answer 23)

                  A system goes from P to Q by two different paths in the P-V diagram as shown in                 Fig. Heat given to die system in path 1 is 1000J. The work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?                

Answer:

                  \[dQ=dU+dW\] or \[dU=dQdW\]                 \[{{W}_{1}}={{W}_{2}}+100\]                 Since \[dU\] is same in both the cases.                 \[\therefore \] \[Q\,=1000\,\,J-100\,\,J=900\,J.\]