use Heisenberg uncertainty principle,
Δx*Δv = h/(4*pi*m)
Here:
Δv = 0.4 Ao = 4.0*10^-11 m
mass, m = 9.11*10^-31 Kg
Putting values,
4.0*10^-11*Δ v = (6.626*10^-34)/(4*3.14*9.11E-31)
4.0*10^-11*Δ v = 5.791*10^-5
Δv = 1.448*10^6 m/s
Answer: 1.45*10^6 m/s
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