Q:

Consider an electron that is in its ground state in an atom. When this electron moves to another state in the atom it is said to have

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Consider an electron that is in its ground state in an atom. When this electron moves to another state in the atom it is said to have


  1. gained energy and to be in an excited state
  2. gained energy and to be in a metastable state
  3. lost energy and undergone stimulated emission
  4. lost energy and to be part of a population inversion

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A: “Ground state” is the state of lowest energy, hence it can only move to a higher energy state. In this case it is said to be excited.

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