hν = φ + Kinetic Energy
hν = φ + qVs where Vs is stopping potential.
Here φ is the work function which is Planck’s constant times the threshold frequency (v0), a frequency below which the electrons cannot be ejected. Therefore,
φ = hv0
This threshold frequency is the characteristic of the metal.
Important Results:
Increasing the frequency of the incident beam, keeping the number of incident photons fixed (this would result in a proportionate increase in energy) increases the maximum kinetic energy of the photoelectrons emitted. Thus,the stopping voltage increases.
The number of electrons ejected also changes because the probability that each photon results in an emitted electron is a function of photon energy.
If the intensity of the incident radiation is increased, there is no effect on the kinetic energies of the photoelectrons.
Increase in intensity of incident beam (keeping the frequency fixed) increases the magnitude of the photoelectric current, though stopping voltage remains the same.
Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron depends on the frequency of the incident light, but is independent of the intensity of the incident light so long as the latter is not too high.
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Downloads: 12 | ||||
Updated At: 2024-04-22 15:02:13 | ||||
Publisher: KIDSS Chifro | ||||
Operating System: Android | ||||
License Type: Free Trial |