Crookes Radiometer: Momentum Transfer Explained

[cragar]

Does it start turning because when the photon hits the little flag it transfers its momentum?
And because one side will absorb and one side reflects, the momentum transfer will be different so it will turn.

 

[Bobbywhy]

A good explanation of how a Crookes Radiometer works is found at:

http://en.wikipedia.org/wiki/Crookes_radiometer