In the beginning of the twentieth century, some scientists thought that a nucleus may contain both  electrons and protons. Use the Heisenberg uncertainty  principle to show that an electron cannot be confined  within a nucleus. Repeat the calculation for a proton.  Comment on your results. Assume the radius of a  nucleus to be 1.0 × 10-15 m. The masses of an electron  and a proton are 9.109 × 10-31 kg and 1.673 × 10-27 kg, respectively.

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