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

6B40.20 • C+65+20

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.

Related Demos

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6B40.41 Detection of the IR, visible, and UV spectra using arc lamp. 6B40.41 Detection of the IR, visible, and UV spectra using arc lamp on TV camera. 6B40.55 As light bulb filament increases temp. its spectrum shifts red to blue.

C+65+0 Concave mirrors focus candle flame on thermopile across bench. C+65+2 Light the Match. C+65+5 Computer demo: Kirchhoff's radiation law, runs 15 min. C+65+10 Large transformer heats metal strip with chalk marks on it. C+65+15 Crooke's radiometer with flashlight, arc lamp or IR source. C+65+25 FLIR T200 Infrared camera C+65+30 Blackbody color change as temperature increases C+65+30 Applet: The Greenhouse Effect C+65+35 Applet: Radiating Charge C+65+40 Applet: Blackbody Spectrum C+65+45 Applet: Synchrotron Radiation C+65+50 Applet: Blackbody Radiation C+65+55 Applet: Plank Radiation Formula C+65+60 Applet: Electrodynamics Simulation C+65+65 Applet: Antenna Simulation