Question
An particle with kinetic energy 10 MeV is heading towards a stationary pointnucleus of atomic number Z = 50. Calculate the distance of closest approach.

None of these



diffcult
Solution
When the particle (charge +2e) comes closest to the nucleus (charge +Ze), it is momentarily at rest and its initial kinetic energy K is completely converted into electrostatic potential energy.
Let r_{0} be the distance of closest approach of the particle to the nucleus. At this distance, the potential energy of the particle is
.
Here,
,
.
.
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