If the energy of H-atom in the ground state is -E, the velocity of photo-electron emitted when a photon having energy `E_p` strikes a stationary `Li^(2+)` ion in ground state, is given by:
A
`v=sqrt((2(E_(p)-E))/(m))`
B
`v=sqrt((2(E_(p)+9E))/(m))`
C
`v=sqrt((2(E_(p)-9E))/(m))`
D
`v=sqrt((2(E_(p)-3E))/(m))`
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