Imagine a cube 2 meters square on every side. Imagine all six inner surfaces are lined with high quality mirrors, with no seams. Imagine that in the center of the room there is a small light bulb of the 60W variety. There is a tiny light sensor that leads to a meter on the oustide. The light is on. Now flick it off.

What happens inside the cube?

a. It goes dark as quickly as when you turn off the light in a sealed closet.

b. It goes dark imperceptibly slower than in the sealed closet.

c. It stays lit surprisingly long.

d. If the mirrors were perfect and you took out the sensor and made the light source invisible, you’d have a perpetual source of light, except that it would be completely sealed and thus of less use than a whale oil lamp.

e. Something else happens. [Tags: quiz puzzle doep physics]

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