Be sure that you play with the two student exercises so that you understand Planck's distribution formula.
You can also make a substitute Leslie's cube using a square metal container, and painting one side matte black, one side shiny black, one side white, and leaving one side as shiny metal. It should be large enough to hold a small 40W lightbulb and socket. Make a "floor" and lid of aluminum foil to retain the heat, with a hole in the floor for the socket cord. Make a hole in the lid so that you can suspend a thermometer above the light bulb.
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