Posted by **Nat** on Saturday, May 9, 2009 at 7:29am.

What is the momentum of a proton travelling at v = 0.95c in the x-direction

in the reference frame?

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**drwls**, Saturday, May 9, 2009 at 7:42am
Photons all travel at velocity c in a vacuum, in any reference frame. The momentum depends upon the frequency. This question has no answer.

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**Nat**, Saturday, May 9, 2009 at 7:47am
will I be able to calculate the momentum if I know the mass of the proton?

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**Dez**, Saturday, May 9, 2009 at 8:11am
Is the question assuming the proton is travelling relativistically or not?

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**Count Iblis**, Saturday, May 9, 2009 at 8:14am
p = gamma m v

gamma = 1/sqrt[1-(v/c)^2]

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**drwls**, Saturday, May 9, 2009 at 8:58am
The mass of a photon is zero; yet it has momentum. The momentum (as well as th energy) depends upon the frequency, which you have not provided.

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**RickP**, Sunday, May 10, 2009 at 4:16am
Nat, use what Count Iblis provided.

PS: drwls, the question asks about the momentum of a proton, not a photon.

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