Q. The radius of germanium (Ge) nuclide is measured to be twice the radius of ⁹₄Be. The number of nucleons in Ge are :
A) 73
B) 74
C) 76
D) 72
Explanation
[Solution from source] Nuclear radius R = R₀A^(1/3), so doubling R needs A to increase by 2³ = 8. The Ge nucleus therefore has 8 × 9 = 72 nucleons. The other numbers are other germanium isotopes, not the one fixed by this radius. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.