if photons in motion have mass and energy why don't they knock stuff over
"4B" wrote in message ...
What about those small propels that "mysteriously" spin when they are put
close to a source of light. Is not the momentum of the photons that make
them spin?
4B
No. The vanes are black on one side, white on the other. This
results in a temperature differential which causes a pressure
differential.
Paul Cardinale
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