Question
What is the upper limit of the radius of the gold nuclues (Z = 79), if an particle of energy 12.5 MeV is deflected back by the nucleus through 180^{o}.

None of these



easy
Solution
The distance of closest approach of an particle (charge +2e) of initial kinetic energy K, scattering through 180^{o} from a nucleus of atomic numberZ is given by
Substituting the given value, we get
The radius of the gold nucleus is, therefore, less than (= 18 fermi). This is the upper limit of the radius of gold nucleus.
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