Question

The approximate radius of polonium nucleus of mass number 210 is:

• A. $7.72\times {10}^{-15}m$
• B. $7.72\times {10}^{-14}m$
• C. $4\times {10}^{-9}m$
• D. $4\times {10}^{-12}m$

Answer 1

The correct option is A $7.72\times {10}^{-15}m$

Radius of nucleus can be estimated by,

$R=1.3\times {10}^{-13}\times A^{\frac{1}{3}}$

Where A is the mass number.

$\therefore R=1.3\times {10}^{-13}\times (210{)}^{\frac{1}{3}}$

$=7.72\times {10}^{-15}m$

Hence, option $A$ is correct.