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- Thread starter JDude13
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What keeps particles with different types but simmilar levels of energy from being the same particle?

- #4

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Anyway, the answer to your question is that the momentum is different for particles of differing mass but with same energy.

- #5

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How do you come to that conclusion? This is confusing energy relations, which can be found by looking under the heading "The relativistic energy-momentum equation" at http://en.wikipedia.org/wiki/Mass_in_special_relativity, with the de Broglie relation p = hf/c (I here use f for frequency). There is a universal relationship betweenThe energy relation that you provided (E=hv) works only for massless particles, like the photon, which always moves at the speed of light. Therefore your question isn't quite consistent with the equation...

..oops, your equation is valid for all particle types. My mistake. I mistook your 'v' as somehow being related to velocity instead of the frequency...

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- #6

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Anyway, the answer to your question is that the momentum is different for particles of differing mass but with same energy.

But the equation doesn't say anything about momentum; just energy.

Could you please explain to me where momentum comes in?

- #7

A. Neumaier

Science Advisor

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This only holds for eigenstates of the Hamiltonian. It says nothing about mass m and velocity v. The latter quantities must be measured independently and are related to the energy and momentum p by (E/c)^2=(mc)^2+p^2 and p=mv.

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