The figure shows the energy levels for an electron in a finite potential energy well.If an electron in the n = 2 state absorbs a photon of wavelength 2.0 nm, what happens to the electron? 
A) It makes a transition to the n = 3 state.
B) It makes a transition to the n = 4 state.
C) It escapes the well with a kinetic energy of 280 eV.
D) It escapes the well with a kinetic energy of 730 eV.
E) Nothing; this photon does not have an energy corresponding to an allowed transition so it is not absorbed.
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