Two spherical nuclei have mass numbers 216 and 64 with their radii R₁ and R₂,

Two spherical nuclei have mass numbers 216 and 64 with their radii R₁ and R₂, respectively. The ratio, R₁/R₂ is equal to

Options

(a) (3:2)
(b) (1:3)
(c) (1:2)
(d) (2:3)

Correct Answer:

(3:2)

Explanation:

Radius of nuclei having mass number A is determined as
R = R₀ A¹/³ (where R₀ = constant)
where, R₀ = 1.2 x 10⁻¹⁵ m
This implies, R₁/R₂ = (A₁/A₂)¹/³ = (216/64)¹/³ = 6/4
R₁:R₂ = 3:2

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