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Physics, Astronomy & Cosmology / Can Photons Collide With Each Other?
« on: 25/07/2007 18:42:49 »
Dear Lightarrow;
Quote Lightarrow;
“Light has momentum: p = E/c; E = energy.
Since dp/dt = F (force) it means that F = W/c; W = power. So, from the light beam's power in Watt, dividing by c (299,792,458 m/s), you immediately have the beam's push in Newton!
It results in a very tiny push, however: with 1 Giga Watt laser you achieve only 3.3 N (about 340 grams).”
Some time back I saw a demonstration where a laser was used to power a spinning highly polished disk up to; I believe it was 700 ft.
And only stopped going do to it ‘s spin slowed down and the disk became unstable and didn’t stay in line with the laser.
Ed
Quote Lightarrow;
“Light has momentum: p = E/c; E = energy.
Since dp/dt = F (force) it means that F = W/c; W = power. So, from the light beam's power in Watt, dividing by c (299,792,458 m/s), you immediately have the beam's push in Newton!
It results in a very tiny push, however: with 1 Giga Watt laser you achieve only 3.3 N (about 340 grams).”
Some time back I saw a demonstration where a laser was used to power a spinning highly polished disk up to; I believe it was 700 ft.
And only stopped going do to it ‘s spin slowed down and the disk became unstable and didn’t stay in line with the laser.
Ed