PIRA 4D20.10 Mean Free Path: Crookes' Radiometer
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Photo of the Demonstration at the University of Texas at Austin.
Instructions / Notes:
- A Crookes radiometer is placed in front of an electric lamp - The lamp is as a source of radiant heat energy.
- The interior of the Crookes radiometer is under partial vacuum.
- One side of each pane is painted white. While the other side is black.
- So, there is a small heat differential between the two surfaces.
- A second radiometer, with a mirrored side, is used to show what happens when less radiant energy strike the panes.
Last Updated 4/2012 - University of Texas at Austin Physics Department - All Rights Reserved