Gaseous calcium atoms absorb light at 423, 272, and 240 nm. After a  photon of 272 nm is absorbed from the ground state, a photon  of wavelength 672 nm is emitted. After absorption of a photon of 240 nm  occurs from the ground state, a photon is emitted of wavelength 504 nm.  After the 504 nm photoemission occurs, what wavelength of light (in nm) would have to be emitted for an electron to return to the ground state? Construct an energy diagram to help.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter29: Atomic Physics
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Gaseous calcium atoms absorb light at 423, 272, and 240 nm. After a  photon of 272 nm is absorbed from the ground state, a photon  of wavelength 672 nm is emitted. After absorption of a photon of 240 nm  occurs from the ground state, a photon is emitted of wavelength 504 nm.  After the 504 nm photoemission occurs, what wavelength of light (in nm) would have to be emitted for an electron to return to the ground state? Construct an energy diagram to help. 

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