.
Assuming the atom and the nucleus to be spherical.
(a) What will be the ratio of their sizes ?
(b) If atom is represented by planet earth 
estimate
the size of the nucleus.
Answer:
(a) Atomic size is represented in terms of atomic radius, 
As volume of sphere 
, therefore
and 
Thus, the ratio of volumes
(b)
or
If atom is represented by planet earth with
Then, volume of atom
Volume
of nucleus
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