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Hey everyone!

I'm having some trouble with this question and i would really appreciate any help!

Atoms are bombarded by photons. This causes these atoms to move from ground state to the first excitation state of 4.36 eV. What is the momentum of the photons?

I understand that the photon must provide the electron with 4.36 eV or 6.99e-19 J of energy in order to move it from its ground state to the first excitation state. What i am unsure of is wether this energy is equal to the total kenetic energy of the photon before. Can the photon not have more energy than this???

Thanks for any help!!

AF403

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# Homework Help: Need help please!

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