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Questions and Answers
What did Einstein postulate about the incident photons in his 1917 paper?
What did Einstein postulate about the incident photons in his 1917 paper?
- They have energies equal to the energy of a photon ejected by an excited atom.
- They have energies equal to the energy of an excited atom in its lower energy state (correct)
- They have energies equal to the energy of an excited atom in its higher energy state
- They have energies equal to the energy of a non-excited atom.
What is the full form of the acronym LASER?
What is the full form of the acronym LASER?
- Light Absorption by Spontaneous Emission of Radiation
- Light Absorption by Stimulated Emission of Radiation
- Light Amplification by Spontaneous Emission of Radiation
- Light Amplification by Stimulated Emission of Radiation (correct)
What happens to an excited atom when it falls to its lower energy state?
What happens to an excited atom when it falls to its lower energy state?
- It absorbs a photon in phase with the incident photon that stimulated it.
- It emits a photon in phase with the incident photon that stimulated it. (correct)
- It absorbs a photon out of phase with the incident photon that stimulated it.
- It emits a photon out of phase with the incident photon that stimulated it.
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