05-01-2012, 12:53
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Professor of Thinkology, ThD
AKA: @taylorstem
 FRC #3487 (Red Pride Robotics) Team Role: Teacher
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Join Date: Jan 2006
Rookie Year: 2006
Location: Indianapolis, IN, USA 46227
Posts: 4,604
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Re: A Physics Quiz of a different type
Quote:
Originally Posted by DonRotolo
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OK, does a photon have mass? If yes, then it cannot travel at the speed of light, but since it does, at rest it must be massless. (Yes, it has momentum, but that's a special case. In theory you can approach the speed of light using a flashlight as your propulsion unit. Might take a while though...)
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Related, and asked by a student to me a couple weeks ago:
When light is reflected, at the point of reflection, is the speed zero?
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Hi!
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