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A 5.5 MeV alpha particle comes within about what distance of a gold nucleus?
A4.0 × 10⁻¹⁰ m
B1.2 × 10⁻¹⁵ m
C4.0 × 10⁻¹⁸ m
D4.0 × 10⁻¹⁴ m
Answer & Solution
Correct answer: D. 4.0 × 10⁻¹⁴ m
Geiger and Marsden found the closest approach is about 4.0 × 10⁻¹⁴ m, so the nucleus is smaller than that.
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