Chemistry - Atomic Structure Question with Solution | TestHub

Consider a helium$\left(\mathrm{He}\right)$atom that absorbs a photon of wavelength$330 \mathrm{nm}$. The change in the velocity (in$\mathrm{cm} {\mathrm{s}}^{-1}$) of$\mathrm{He}$atom after the photon absorption is ______ .
(Assume: Momentum is conserved when photon is absorbed.
Use: Planck constant$=6.6\times {10}^{-34} \mathrm{J} \mathrm{s}$, Avocados number$=6\times {10}^{23}{ \mathrm{mol}}^{-1}$, Molar mass of$\mathrm{He}=4 \mathrm{g}{ \mathrm{mol}}^{-1}$)