According to Heisenberg's uncertainty principle, the product of uncertainties in position and velocities for an electron of mass $9.1\times {10}^{-31}\mathrm{kg}\mathrm{is}$

Given that mass of electron = $9.1\times {10}^{-31}\mathrm{kg}$

Planck's constant = $6.63\times {10}^{-34}{\mathrm{m}}^2{\mathrm{s}}^{-1}$

$\begin{array}{l}\mathrm{By} \mathrm{using} \mathrm{\Delta x}\times \mathrm{\Delta p}=\frac{\mathrm{h}}{4\mathrm{\pi }}\mathrm{\Delta x}\times \mathrm{\Delta vm}=\frac{\mathrm{h}}{4\mathrm{\pi }}\\ \mathrm{where}:\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\mathrm{\Delta x}\mathrm{\hspace{0.17em}}=\mathrm{uncertainty}\hspace{0.17em}\hspace{0.17em}\mathrm{in}\hspace{0.17em}\hspace{0.17em}\mathrm{position}\\ \hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\mathrm{\Delta v}\mathrm{\hspace{0.17em}}=\mathrm{uncertainty}\hspace{0.17em}\hspace{0.17em}\mathrm{in}\hspace{0.17em}\hspace{0.17em}\mathrm{velocity}\\ \mathrm{\Delta x}\hspace{0.17em}\hspace{0.17em}\times \hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\mathrm{\Delta v}\hspace{0.17em}\hspace{0.17em}=\frac{\mathrm{h}}{4\mathrm{\pi }\mathrm{\hspace{0.17em}}\times \hspace{0.17em}\hspace{0.17em}\mathrm{m}}=\frac{6.63\times {10}^{-34}}{4\mathrm{\hspace{0.17em}}\times \mathrm{\hspace{0.17em}}3.14\mathrm{\hspace{0.17em}}\times \mathrm{\hspace{0.17em}}9.1\mathrm{\hspace{0.17em}}\times \mathrm{\hspace{0.17em}}{10}^{-31}}\\ =\hspace{0.17em}\hspace{0.17em}5.8\times {10}^{-5}\hspace{0.17em}\hspace{0.17em}{\mathrm{m}}^2\mathrm{\hspace{0.17em}}{\mathrm{s}}^{-1}\end{array}$