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It was once thought that a neutron was made up of an electron and a proton...

It was once thought that a neutron was made up of an electron and a proton held together by Coulomb attraction. Assume the neutron radius is 10^-15m. (a) According to the uncertainty principle, find ∆p for such an electron. (b) The lowest average momentum such an electron could have would be 1/2 ∆p. What would be the corresponding energy? (c) What is the electrostatic potential energy of an electron 10^-13cm from a proton? (d) For the calculation in (b) and (c) does it appear likely that a neutron could be made up of an electron and proton? Briefly explain.

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