You point a laser flashlight at the Moon, producing a spot of light on the Moons surface.

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You point a laser flashlight at the Moon, producing a spot of light on the Moon’s surface. At what minimum angular speed must you sweep the laser beam in order for the light spot to streak across the Moon’s surface with speed v > c? Why can’t you transmit information between research bases on the Moon with the flying spot?

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Modern Physics

ISBN: 9781429250788

6th Edition

Authors: Paul A. Tipler, Ralph Llewellyn

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