Question

The approximate radius of polonium 210 nucleus in microns is :

• A. $18.3\times {10}^{-13}m$
  
• B. $4.15\times {10}^{-13}m$
  
• C. $6.63\times {10}^{-13}m$
  
• D. $8.3\times {10}^{-13}m$
  

Answer 1

Answer: (D)

$8.3\times {10}^{-13}m$

The approximate radius of polonium 210 nucleus is 8.3 m.
The size of the nucleus can be calculated from the expression
$r=(1.4\times {10}^{-13})A^{1/3}m=(1.4\times {10}^{-13})\times {210}^{1/3}=1.4\times {10}^{-13}\times 5.94=8.3\times {10}^{-13}m$.