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To: Nifster

“Lord you know so little fundamental science.”

Well, you're at least half right.

I haven't thought about radiometers in 50 years, so, guilty, your honor, I thought they were vacuum sealed, and I thought the motion was caused by photons agitating the electrons in the vane.

As to fundamental science, hmmm, I think I could still crack the top 10 percentile on a standardized test.

I know that photons have no mass, but I always assumed that was a theoretical convenience that allowed them to have properties of both waves and particles.

And, as I recall, it is theoretically impossible for a photon to have zero mass inside a super conductor.

But I'm sure you'll set me straight if I'm mistaken.

36 posted on 03/06/2012 2:12:17 PM PST by zeestephen
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To: zeestephen

The finer point is that a photon is a fundamental quantum particle....it has no mass at rest. The radiometer works because the vanes you mentioned are both dark and light ( usually black and white) and the heating of them is differential which causes the spinning.

Photons have been observed to behave as both particles and waves which is why the duality of light is such a difficult concept to teach to beginning physics students. Theoretical constructs can be useful but this was derived by scientific testing


42 posted on 03/06/2012 10:10:54 PM PST by Nifster
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