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A 100 eV electron collides with a statio...

A `100 eV` electron collides with a stationary helium ion `(He^(+))` in its ground state and excites to a higher level. After the collision , `He^(+)` ion emits two photons in succession with wavelength `1085 Å and 304 Å`. Find the principal quantum number of the excite in its ground state and. Also calculate energy of the electron after the collision. Given `h = 6.63 xx 10^(-34) J s`.

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