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Q.

The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from A → B → C is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is:

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a

70 J

b

34 J

c

134 J

d

84 J

answer is D.

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Detailed Solution

Heat given $∆ Q = 20 c a l = 20 \times 4.2 = 84 J .$

Work done ∆W = – 50 J [As process is anticlockwise]

By first law of thermodynamics

$\Rightarrow ∆ U = ∆ Q - ∆ W = 84 - (- 50) = 134 J$

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