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threshold energy
subjectfact 
threshold energyhas definition Difference between the energy at the first excited level and that of the ground state.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:33:13.0
is a kind of energy2001-09-27 09:33:13.0
energyhas unit energy unit2001-09-27 09:33:13.0
numberhas value2001-09-27 09:32:57.0