In a nuclear physics experiment, a proton is fired toward a Z = 13 nucleus with the diameter and neutron energy levels shown inFigure 40.17. The nucleus, which was initially in its ground state, subsequently emits a gamma ray with wavelength 1.73 × 10^-4nm. What was the minimum initial speed of the proton?

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A radioactive decay has left the neutron in the n= 3 excited state. The neutron jumps to the n = 1 ground state, emitting a gamma-ray photon. Energy levels of a neutron in the nucleus O MeV 13.4 MeV n=4- -28.5 MeV n=3 n=2+ 40.4 MeV 47.6 MeV n=1 -50.0 MeV The diameter of the nucleus is 8.0 fm. Gamma-ray emission