What is photoelectric effect?
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Emission of electrons when light of required frequency falls on certain metal surface is called photo electric effect
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In some metals and semiconductors the photoelectric effect is observed.
When light rays or electromagnetic radiation falls on the molecules on the surface, some energy from that radiation is absorbed by the electrons in those molecules. If that energy is more than the energy gap for the (conduction band) electrons, then the jump the energy gap. Then they escape the molecule. The flow through the substance. This creates an electrical current. This effect is called photoelectric effect.
For photoelectric effect to happen:
h * f >= Eg
h = Planck's constant, f = frequency of the radiation
Eg = Energy gap at that temperature, for that material
The electrons flow out of atoms with a kinetic energy = h f - Eg.
When light rays or electromagnetic radiation falls on the molecules on the surface, some energy from that radiation is absorbed by the electrons in those molecules. If that energy is more than the energy gap for the (conduction band) electrons, then the jump the energy gap. Then they escape the molecule. The flow through the substance. This creates an electrical current. This effect is called photoelectric effect.
For photoelectric effect to happen:
h * f >= Eg
h = Planck's constant, f = frequency of the radiation
Eg = Energy gap at that temperature, for that material
The electrons flow out of atoms with a kinetic energy = h f - Eg.
kvnmurty:
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