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How much energy is required to ionize a hydrogen atom in its ground (or lowest energy) state?

What wavelength of light contains enough energy in a single photon to ionize a hydrogen atom?

  • chem -

    I would do the second part first.
    1/lambda = R*(1/N^2 - 1/N^2).
    You know the Rydberg constant, the first N is 1 and and N2 is infinity. Solve for lambda.
    Then E = hc/lambda

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