If the electron is initially in the ground level, E1=0.625E[infinity]E1=0.625E[infini ty], and absorbs a photon, what maximum wavelength can the photon have and still liberate the electron from the well?

 λ = 3.1824 10-25 m

Explanation:

To release the electron from the power well the absorbed photon electro must be greater than or equal to the energy of the electron in the power well

The photon energy is E_photon = 0.625 J

The speed of light is

       c = λ f

Let's use Planck's equation

        E = h f

We substitute

       E = h c / λ

        λ = h c / E

        λ = 6.63 10-34 3 108 / 0.625

         λ = 3.1824 10-25 m

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