Question 56

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

Correct Answer: 30

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