A student says that a material particle must always move at a slower speed than the speed of light, and that a massless particle must always move at the same speed as the speed of light, both of which are incorrect. Is she correct in her assessment? If this is the case, how could massless particles such as photons and neutrinos achieve such a high rate of acceleration? Isn't it possible to start from a standing start and accelerate? Explain.

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter39: Relativity
Section: Chapter Questions
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A student says that a material particle must always move at a slower speed than the speed of light, and that a massless particle must always move at the same speed as the speed of light, both of which are incorrect. Is she correct in her assessment? If this is the case, how could massless particles such as photons and neutrinos achieve such a high rate of acceleration? Isn't it possible to start from a standing start and accelerate? Explain.

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