\(\Delta v\,\, = \,\,\frac{h}{{4\pi \Delta x.m}}\,\,\,\,\, = \,\,\frac{{6.6 \times {{10}^{ - 34}}}}{{4 \times 3.143 \times 0.150}}\,\,\,\, = \,\,3.499 \times {10^{ - 24}}\,m{s^{ - 1}}\)
$(h\, = 6.626 \times 10^{-34}\, Js, N_A\, = 6.022 \times 10^{23}\, mol^{-1} )$