The numerical value of the takenquantity will be:
Hence, the numerical value of thetaken quantity is much smaller than the typical size of an atom.
(b) Chargeon an electron, e = 1.6 × 10−19 C
Mass of an electron, me =9.1 × 10−31 kg
Planck’s constant, h =6.63 ×10−34 Js
Letus take a quantity involving the given quantities as 
Where,
∈0 = Permittivity of free space
And, 
The numerical value of the takenquantity will be:
Hence, the value of the quantitytaken is of the order of the atomic size.