Question

If the radius of a nucleus is $6.6$ fermi. Find its mass number, where $R_0=1.1$ fermi

• A. $216$
• B. $36$
• C. $3$
• D. $1$

Answer 1

Answer: (A)

$216$

$\text{Radius of Nucleus,}$

$R=R_0{A}^{1/3}$

$\text{Where "A" is Mass Number}$

$\text{Given,}R=6.6\text{fermi},R_0=1.1\text{fermi}$

$\begin{array}{cc}6\cdot 6=1\cdot 1& A^{1/3}\\ A^{1/3}=6& \\ A=6^3& \end{array}$

$=216$