solar pinwheels are propelled from light? why does this happen?
if these pinwheels gain momentum from light, then how is this possible? does it have to do with the white/black colors? does say the heat in the bulbs play a factor? and if light can be used as a propellent, then wouldnt it be true if you shined a flashlight towards a piece of paper, in a zero G environment (space), the piece of paper would be propelled by the light?
It turns out that the actual reason these things (called radiometers) turn has less to do with light pressure and more to do with the fact that there’s not a perfect vacuum in them. There’s enough vapor to get convection going, so they’re propelled by the movement of gas.
For a more complete explanation, see http://en.wikipedia.org/wiki/Crookes_radiometer
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