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Consider a helium(He) atom that absorbs ...

Consider a helium(He) atom that absorbs a photon of wavelength 330nm. The change in the velocity (in `cms^(-1)`) of He atom after the photon absorption is------.
(Assume: Momentum is consrves when photon is absorder.
Use:Plank constant=`6.6xx10^(-34)Js`, Avogadro number= `6xx10^(23)mol^(-1)`, molar mass of He= `4gmol^(-1)`

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