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What is the accepted explanation for the movement of the paddles in a solar or Crookes radiometer?

asked in physics, solar radiometer

Messerwisser answers:

The bulb has not complete vacuum.
The black side of the paddle absorbs heat that is heating the gas molecules which increases their velocity and gives a recoil to the paddle. The shiny side does not absorb heat to the same extent.

Supplement from 12/22/2008 09:21pm:

It seems I remembered it right:

It has also been explained with the "photonic pressure", but I think that is wrong as it does not work with complete vacuum.

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