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Oct 30, 2016 at 17:56 comment added dmckee --- ex-moderator kitten They are not estimates. They are exactly correct for massive particles. They just are not general enough to include massless particles.
Oct 30, 2016 at 13:29 comment added hsinghal @Mockingbird yes you are right.
Oct 30, 2016 at 11:16 comment added Mockingbird Which is another way of saying that it doesn't work for photon.
Oct 30, 2016 at 10:58 history answered hsinghal CC BY-SA 3.0