A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2:1. The ratio of their nuclear sizes will be

2^1/3:1

1:3^1/2

3^1/2:1

3^1/2:1

1:3^1/2

Law of conservation of momentum gives
m₁ v₁ = m₂ v₂

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Nuclei

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