Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes.

Question

Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes.

If this room is a closed system, what happens to the total amount of energy in the room?

A.
It increases.

B.
It increases, then decreases.

C.
It remains constant.

D.
It decreases.

It's C

Answer 1

The electric company is supplying energy to the room and it is heating up. We hope she is using a CFL or LED lamp to minimize heating of the room and waste of energy.