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calculate the speed to which a stationary 4He atom (mass 4.0026 g/mol) would be accelerated if...

calculate the speed to which a stationary 4He atom (mass 4.0026 g/mol) would be accelerated if it absorbed a photon of 200nm (ultraviolet).  Please enter your answer (m/s) with 3 significant figures  Hint: one 4He atom gains the energy of a photon. note: the mass given is for 1 mole of atoms; also, the SI unit for mass should be kg.

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