If we prepare a particle with energy E and some small spread in energy delta E then its wave function can be expanded with some large countable set of momentum states (exclude states above some very high energy)?(adsbygoogle = window.adsbygoogle || []).push({});

If we have a very large countable set of momentum states it seems we could exclude some states and still make a very good approximation for the wave function for a particle of energy E and energy spread delta E?

Thanks for any help!

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# Number of different ways, particle with E and delta_E.

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