The energy of the electron in the 2s state is -12.98 eV, the energy in the 3s state -10.84 eV. What is the wavelength of the absorbed photon?

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  1. E1 - E2 = h c/(wavelength)

    The energy difference (E1 - E2) is 2.14 eV

    Change that to Joules and use the equation above.

    This is easy stuff. Make an effort.

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