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July 4, 2015

Homework Help: physics

Posted by Brianna on Thursday, May 20, 2010 at 6:15pm.

You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -19.10 eV. The electron absorbs a 4.00-eV photon. The electron immediately drops to an intermediate energy state Einter of energy -17.10 eV. After several seconds the electron drops back down to the ground state.
What is the energy of the state which the electron is in after absorbing the UV photon?


What is the energy of the first photon emitted?


What is the energy of the second photon emitted and is this process considered fluorescence or phosphorescence? (Both answers must be correct for the answer to be correct.)

fluorescence
phosphorescence

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