Find the wavelength of the photon needed to excite the electron in hydrogen from the to level. Please give your answer in nanometers rounded to the nearest hundred nanometers.
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Relevant wiki: Hydrogen Atom
Using Rydberg's formula for electronic transitions:
λ h c = − 1 3 . 6 eV ( 2 5 1 − 9 1 ) .
Plugging in the numbers for h and c and rearranging gives the result λ ≈ 1 3 0 0 nm .