Is Energy Conserved When an Atom Emits a Photon?

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motleycat

When a photon is emitted by an atom is the energy of the atom conserved?

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blue_leaf77

The creation of a photon leaving the atom must imply that the energy of the atom must have changed.

DrClaude

Mentor

The energy of the emitted photon plus the atom after emission is the same as the energy of the atom before emission.

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