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An \( \alpha \)-particle having kinetic energy \( 5 \mathrm{MeV} \) falls on a Cu-foil. The shortest distance from the nucleus of \( \mathrm{Cu} \) to which \( \alpha \)-particle reaches is (Atomic no. of \( \mathrm{Cu}=29, \mathrm{~K}=9 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{C}^{2} \) )
\( \mathrm{P} \)
(a) \( 2.35 \times 10^{-13} \mathrm{~m} \)
(b) \( 1.67 \times 10^{-14} \mathrm{~m} \)
W
(c) \( 5.98 \times 10^{-15} \mathrm{~m} \)
(d) None of these
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