Ground state energy of H-atom is `(E_(1))`,t he velocity of photoelectrons emitted when photon of energy `E_(2)` strikes stationary `Li^(2+)` ion in ground state will be:
A
`v=sqrt((2(E_(2)-E 1))/(m))`
B
`v=sqrt((2(E_(2)+9E 1))/(m))`
C
`v=sqrt((2(E_(2)-9E 1))/(m))`
D
`v=sqrt((2(E_(2)-3E 1))/(m))`
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