Question

The radius of germanium (Ge) nuclide is measured to be twice the radius of $_{4}^{9}Be.$ The number of nucieons in Ge are

• A. 73
• B. 74
• C. 75
• D. 72

Answer 1

Answer: (D)

72

Answer 2

$R = R _{0} A ^{1 / 3}$ \Rightarrow A _{ Ge } =\left(\frac{ R _{ Ge }}{ R _{ Be }}\right)^{3}\left( A _{ Be }\right)=(2)^{3}(9) \\\ $=8 \times 9=72$