Question: A photon excites a Hydrogen atom from its ground level state to its n = 3 orbit. What is the wavelength of the absorbed photon?

A photon excites a Hydrogen atom from its ground level state to its n =3 orbit.
What is the wavelength of the absorbed photon?
What is the radius of the electron in the n =3 orbit?
How many different possible emissions exist for an atom with an electron in its n =3 orbit?
If the same photon that got absorbed by Hydrogen instead hits a metal with a work function of 3 eV, what i maximum kinetic energy of the photoelectron released?

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