The uncertainity in the position of an electron (mass 9.1×10−28 g) moving with a velocity of 3.0×104 cm−1 accurate up to 0.011%, will be

Δx=? cm me=9.1×10−28 g ϑ=3×104 cms−1 Δϑ=3×104×0.011100=3.3 (Δx)(Δϑ)=h4πm (Δx)=h4πm(Δϑ)            =6.6×10−274×3.14×9.1×10−28×3.3            =0.17 cm