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There are
Zprotons in the nucleus of an atom, where
Zis the atomic number of the element. An
\alpha particle carries a charge of
+2e. In a scattering experiment, an
\alpha particle, heading directly toward a nucleus, will come to a halt when all the particle's kinetic energy is converted to electric potential energy. In such a situation, how close will an
\alpha particle with a kinetic energy of
4.40\times 10^(-13)Jcome to a nucleus with atomic number
Z=89?