Crooke's radiometer with flashlight or IR source.

4D20.10 • E+65+5

diagram for demo

Crooke's Radiometer with white light source or IR source. Light from a flashlight,arc lamp, slide-projector, laser pointer or InfraRed source illuminates the Radiometer. The vanes of the Radiometer turn. The device has a slight amount of gas inside. Each vane is black on one side and silvered on the other.The black side absorbs IR and heats up, heating the adjacent gas. The temperature difference between the two vanes creates a convection from the light side to the dark side. And by Newton's 3rd Law, the vanes move in the opposite direction. (Same apparatus as X and X).

Related Demos

4D20.10 Crooke's radiometer with flashlight, arc lamp or IR source. 4D20.10 Crooke's radiometer with flashlight, arc lamp or IR source.
E+65+0 IR source illuminates audience viewed with CCD TV camera in dark room. E+65+10 Detection of the IR, visible, and UV spectra using arc lamp. E+65+12 FLIR T200 Infrared camera E+65+15 Concave mirrors and horn thermopile senses candle across room. E+65+20 Measurement of light intensity: Footcandle meter. E+65+25 As light bulb filament increases temp. its spectrum shifts red to blue. E+65+30 UV light causes mineral and fabric samples to fluoresce different colors. E+65+35 Applet: Blackbody Spectrum