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प्रश्न
How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's photoelectric equation?
Using photon picture of light, show how Einstein’s photoelectric equation can be established.
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उत्तर
n photoelectric effect, an electron absorbs a quantum of energy (hν) of radiation. If this quantum of energy exceeds the minimum energy needed for the electron to escape from the metal surface (work function ϕ0), the electron is emitted with maximum kinetic energy
Kmax = hν - ϕ0
संबंधित प्रश्न
The work function of caesium metal is 2.14 eV. When light of frequency 6 × 1014 Hz is incident on the metal surface, photoemission of electrons occurs. What is the
- maximum kinetic energy of the emitted electrons,
- Stopping potential, and
- maximum speed of the emitted photoelectrons?
An isolated metal sphere is heated to a high temperature. Will it become positively charged due to thermionic emission?
The wavelength λe of an electron and λp of a photon of same energy E are related by ______.
What do you mean by electron emission? Explain briefly various methods of electron emission.
A 150 W lamp emits light of the mean wavelength of 5500 Å. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second.
In which case is electron emission from a metal not known?
Photoelectric emission is observed from a metallic surface for frequencies ν1 and ν2 of the incident light (ν1 > ν2). If the maximum value of kinetic energy of the photoelectrons emitted in the two cases are in the ration 1 : n then the threshold frequency of the metallic surface is ______.
Name the factors on which photoelectric emission from a surface depends.
What is the work function (\[\phi_0\]) of a metal?
Which particles at the surface hold free electrons inside the metal?
