Wednesday, December 8, 2010

Travelling Light

Because photons impart momentum, physicists demonstrated that light can move insect's wings.

A wing experiences different pressures on its top and bottom side to stay in flight. But aside from air, light can also create pressure. When photons pass through or reflect off of something, they induce momentum in that object. Researchers zapped a tiny wing-shaped rod with a laser beam causing the wing to move.

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