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CBSE Class 12 Physics 2026 All Sets Paper

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Question : 3 of 16
Marks: +1, -0
The radius of a nucleus of mass number 125 is:
Solution:  
Given mass number A = 125.
R=1.2×(125)13R = 1.2 \times (125)^{\frac{1}{3}}
R=1.2×5=6.0 fmR = 1.2 \times 5 = 6.0 \text{ fm}
The radius of the nucleus is 6.0 fm.
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