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Are the nucleons fundamental particles, or do they consist of still smaller parts? One way to find out is to probe a nucleon just as Rutherford probed an atom. What should be the kinetic energy of an electron for it to be able to probe a nucleon? Assume the diameter of a nucleon to be approximately 10–15 m.

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We know that, \lambda = h/p and kinetic energy = potential energy

E = hc/ \lambda

Kinetic energy of an electron

KE = PE = hc/ \lambda = 109 eV

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