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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.

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(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 (Re = 6.4×106m) then the

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