Chemistry - Atomic Structure Question with Solution | TestHub

$\alpha$-particle $\left({}_2^4{\mathrm{He}}^{++}\right)$is moving along x -axis with 0.4 meV . If uncertainity in velocity is $1\%$ and minimum uncertainity in x -coordinate is $1.80\times 10^{-\mathrm{x}}\mathrm{m}$, then x is -

(Assume mass of proton and neutron to be approximately equal to 1.66 x 10^-27 kg)

(Use $\sqrt{8.5}=2.91$; charge on electron = $1.6\times 10^{-19}C$; $\pi =3.14$; $h=6.6\times 10^{-34}$)