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Crookes' radiometer H-d2a
Light shining on the "radiometer" makes the vanes spin, but in a direction opposite to that expected for light absorption and reflection. Fishbane Chapter:   19.2 HRW 9th:   18.12 Purcell Chapter:   9.08 SJ 3rd Chapter:   16.5 PIRA DCS classification:   4D20.10

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University