- #1
lightarrow
- 1,965
- 61
For particles with non zero mass m we know that:
E = mc2γ (1)
P = mvγ (2)
with the usual meaning of the symbols.
From those two equations is easy to prove the equation:
E2 = (cp)2 + (mc2)2 (3)
which doesn't contain the factor γ any longer and so it can even be used for particles of speed = c as photons. But is this really correct? We started from equations (1) and (2) which *are not* applicable to v = c particles.
Is there a more general way to prove (3)?
--
lightarrow
E = mc2γ (1)
P = mvγ (2)
with the usual meaning of the symbols.
From those two equations is easy to prove the equation:
E2 = (cp)2 + (mc2)2 (3)
which doesn't contain the factor γ any longer and so it can even be used for particles of speed = c as photons. But is this really correct? We started from equations (1) and (2) which *are not* applicable to v = c particles.
Is there a more general way to prove (3)?
--
lightarrow