What is the difference between incandescence and luminescence? What does it mean
ID: 511219 • Letter: W
Question
What is the difference between incandescence and luminescence?What does it mean when an electron is in an excited state?
What is the difference in electron configuration of a single and triplet state? What is the difference between incandescence and luminescence?
What does it mean when an electron is in an excited state?
What is the difference in electron configuration of a single and triplet state?
What does it mean when an electron is in an excited state?
What is the difference in electron configuration of a single and triplet state?
Explanation / Answer
1.
Incandescence is light from heat energy. If you heat an object to a high enough temperature, it will begin to glow. For example; when an electric stove's heater or metal become "red hot" in a flame begin to glow, that is incandescence. When the tungsten filament in an ordinary incandescent light bulb is heated it glows brightly "white hot" by the same means. The sun and stars glow by incandescence.
Luminescence is "cold light" that can be emitted at normal and lower temperatures. In luminescence, some energy source send an electron of an atom out of its lowest energy "ground" state into a higher energy "excited" state; then the electron returns the energy in the form of light so it can fall back to its "ground" state.
2.
Electrons which are found in the outermost occupied orbitals of an atom are known as valence electrons. Valence electrons always do not remain in the same orbital or energy level, as they are able to absorb energy from heat or light. When a valence electron absorbs energy, it enters to an orbital also known as an excited state. The excited state can commonly take the form of the electron jumping from its original energy level or orbital, also known as the ground state, to an empty orbital of a higher energy shell that is further away from the nucleus.
3.
In a singlet state, the electrons have opposite spin. The excited electron can relax by expelling energy, and the exclusion principle will be obeyed.
In a triplet state, the electrons have the same spin. The excited electron cannot relax without flipping the spin to obey the exclusion principle, so it takes longer.
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