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A comment on Photoacoustic Effect.
https://en.wikipedia.org/wiki/Crookes_radiometer
People thought the motion was due to radiation pressure at first but the force due to light is probably a few orders of magnitudes off. Turns out it was heat causing the motion.
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https://en.wikipedia.org/wiki/Crookes_radiometer
People thought the motion was due to radiation pressure at first but the force due to light is probably a few orders of magnitudes off. Turns out it was heat causing the motion.