Question

In a process, 600 J of heat is absorbed by a system and 375 J of work is done by the system. The change in internal energy of the process is:

• A. 975 J
• B. -225 J
• C. -975 J
• D. 985 J
• E. 225 J

Hint:

The first law of thermodynamics relates the change in internal energy to the heat absorbed and the work done by the system.

Answer 1

Answer: (E)

According to the first law of thermodynamics, the change in internal energy (\(\Delta U\)) is given by: \[ \Delta U = Q - W \] where \(Q\) is the heat absorbed by the system, and \(W\) is the work done by the system. Substituting the given values: \[ \Delta U = 600\, {J} - 375\, {J} = 225\, {J} \]