Question

A system absorb `600 J` of heat and work equivalent to `300 J` on its surroundings. The change in internal energy
A. `300 J`
B. `400 J`
C. `500 J`
D. `600 J`

Answer 1

Correct Answer - A
We know that `Delta U=Q+W=600+(-300)=300 J`
`W= -300`, because the work done by the system.