Box with white interior appears black from hole in the side.

6B40.20 • C+65+20

diagram for demo

Box with white interior appears black from hole in the side. Black body radiation: No surface is ideally black. The closest approach is shown by means of a small opening in the walls of a closed container. The energy entering the opening is absorbed by the interior walls. With lid open, the interior appears bright. With lid closed, the interior appears dark. TEMPERATURE AND EXPANSION.

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