A student claims that a material particle must always travel at a slower speed than light, but a massless particle must always travel at the same speed as light. Is she right? If that's the case, how can massless particles like photons and neutrinos get their speed? Isn't it possible for them to begin at a standstill and gradually accelerate? Explain.

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A student claims that a material particle must always travel at a slower speed than light, but a massless particle must always travel at the same speed as light. Is she right? If that's the case, how can massless particles like photons and neutrinos get their speed? Isn't it possible for them to begin at a standstill and gradually accelerate? Explain.

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