A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is :

1. 25 : 16

2. 1 : 1

3. 4 : 5

4. 5 : 4

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Answer: 4. 5 : 4

Nuclear radius is \(R=R_0A^{1/3}\).

\(\dfrac{R_1}{R_2}=\left(\dfrac{125}{64}\right)^{1/3}=\dfrac54\)

The ratio is \(5:4\). Option (4).

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