Metastable States and Atomic Energy Levels Quiz
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Questions and Answers

What happens when energy is supplied to atoms?

  • They become stable
  • They are excited to higher energy levels (correct)
  • They become inert
  • They release excess energy

    • What is a metastable state?

  • A state of constant excitation
  • A state of equilibrium
  • A longer lived upper level from where an excited atom does not return to a lower level at once (correct)
  • A state of rapid energy release

    • Why can't population inversion be established in atoms with short-lived excited states?

  • Atoms rapidly return to the lower energy state through spontaneous transitions (correct)
  • Atoms accumulate at the upper energy level
  • Atoms remain in the excited state indefinitely
  • Atoms undergo stimulated emission

    • Why do excited atoms need to 'wait' at the upper energy level to establish population inversion?

    <p>To allow a large number of atoms to accumulate at that level</p> Signup and view all the answers

    Why do atoms in metastable states not rapidly return to the lower energy level?

    <p>They remain excited for an appreciable time</p> Signup and view all the answers

    What is the characteristic of atoms in metastable states?

    <p>They remain excited for an appreciable time</p> Signup and view all the answers

    Why can't population inversion be established in atoms with short-lived excited states?

    <p>Atoms rapidly return to the lower energy level through spontaneous emission</p> Signup and view all the answers

    What is the key requirement to establish population inversion in atoms?

    <p>Excited atoms need to 'wait' at the upper energy level</p> Signup and view all the answers

    What is the significance of a metastable state?

    <p>Excited atoms do not return to the lower level at once</p> Signup and view all the answers

    Why do atoms in metastable states not undergo stimulated emission?

    <p>Atoms do not stay long enough at the excited state for stimulated emission</p> Signup and view all the answers

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