Question

when an excited atom resume to the ground state it emits
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Answer 1

Explanation:

It emits a photon of acertain wavelength

Answer 2

Answer:

When the electron returns to ground state, the energy has to "Go" somewhere, so it is emitted as some type of energy. When you excite copper atoms, the emission occurs as the electron returns to a lower-energy state. This emission takes the form of visible, green light.