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[" A stationary "He'" ion emitted a phot...

[" A stationary "He'" ion emitted a photon corresponding to the first line of the lyman series.The "],[" photon liberates electron from a stationary hydrogen atom in the ground state.The velocity of "],[" the liberated electron is "3.1times10^(@)m/s" .Find "x" (you can make necessary approximations) "],[" [Here by lyman series it is meant that transition is from "n=2" to "n=1" for "He^(+)]]

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