In an inelastic collision an electron ex...

In an inelastic collision an electron excites as hydrogen atom from its ground state to a M -shell state. A second electron collides instantaneously with the excited hydrogen atom in the M-state and ionizes it. At least how much energy the second electron transfers to the atom in the M-state ?

`+3.4 eV`

`+1.51 eV`

`-3.4 eV`

`-1.51 eV`

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