r_nucleus = 1.25 × 10⁻¹³ × (64)^(1/3) = 1.25 × 10⁻¹³ × 4 = 5 × 10⁻¹³ cm. r_atom = 10⁻⁸ cm. Fraction = (r_nucleus/r_atom)³ = (5×10⁻¹³/10⁻⁸)³ = (5×10⁻⁵)³ = 1.25 × 10⁻¹³
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