Question

The ratio of the radii of hydrogen atom and its nucleus is ~ 10⁵. Assuming the atom and the nucleus to be spherical, 

(i) what will be the ratio of their sizes? 

(ii) If atom is represented by planet earth ‘Re’ = 6.4 ×10⁶ m, estimate the size of the nucleus.

Answer 1

(i) Volume of the sphere = 4/ 3 π r ³

Let R be the radius of the atom and r be that of the nucleus. 

⇒ R = 10⁵ r

(ii) If the atom is represented by the planet earth (R_e = 6.4×10⁶m) then the