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Scattering of an \( \alpha \)-particle by an inverse square
\( \mathrm{P} \)
field (like produced by a charged nucleus in
W
Rutherford's model) is shown in figure. If charge of nucleus \( z \) is 79 and kinetic energy of \( \alpha \)-particle is 10 \( \mathrm{MeV} \), then find the impact parameter.
(1) \( 2.1 \times 10^{-14} \mathrm{~m} \)
(2) \( 1.1 \times 10^{-16} \mathrm{~m} \)
(3) \( 1.1 \times 10^{-14} \mathrm{~m} \)
(4) \( 2.2 \times 10^{-16} \mathrm{~m} \)
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