What is meant by spontaneous emission of electrons in solids?
Correct answer: D. Excited electrons going back to lower energy states immediately by releasing energy.
- A. Electrons being emitted by the solids through photoelectric effect when irradiated with electromagnetic radiation
- B. Incident electrons colliding with electrons in solids and releasing doubling the number of incident electrons
- C. Electrons in solids are emitted without any external stimulus through radiation
- D. Excited electrons going back to lower energy states immediately by releasing energy.
Explanation
Spontaneous emission is the process in which a molecule, an atom or a subatomic particle transits from an excited energy state to a lower energy state (e.g., its ground state) and emits a quantized amount of energy in the form of a photon.
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About Dawn of Modern Physics
Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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