Asked by Casey

In Chapter 10 we found that an infinite amount of energy is required to accelerate a massive particle to the speed of light. What does this imply about the mass of a photon?

Answered by Anonymous
must be pretty light :)
Answered by Anonymous
....like vanished
Answered by Anonymous
maybe we should have called it a wave?
Answered by Anonymous
The trick is stopping it to weigh it.
Answered by Anonymous
In fact it has ZERO rest mass but does have momentum and energy at speed. Therefore you can assign mass from E = m c^2 for example.
Google "momentum of photon"
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