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2 days ago · The stopping potential (V₀) is the minimum potential difference that needs to be applied to stop the most energetic photoelectrons emitted from a material. It is directly proportional to the maximum kinetic energy of the photoelectrons.
Stopping potential is the negative potential of the opposite electrode when the photo-electric current falls to zero. The threshold frequency is described as the frequency when the photoelectric current stops below a particular frequency of incident light.
Sep 12, 2022 · In the presence of the stopping potential, the largest kinetic energy \(K_{max}\) that a photoelectron can have is its initial kinetic energy, which it has at the surface of the photoelectrode. Therefore, the largest kinetic energy of photoelectrons can be directly measured by measuring the stopping potential:
Stopping potential is the minimum negative voltage applied to the anode to stop the photocurrent. The maximum kinetic energy of the electrons equal the stopping voltage, when measured in electron volt.
This value of the retarding voltage is called the stopping potential or cut off potential V o. Since the work done by the retarding potential in stopping the electron of charge e is eV o, the following must hold eV o = K max.
The potential at which this occurs is called the stopping potential. It is a measure of the maximum kinetic energy of the electrons emitted as a result of the photoelectric effect. What Lenard found was that the intensity of the incident light had no effect on the maximum kinetic energy of the photoelectrons.
When a metal surface is exposed to a monochromatic electromagnetic wave of sufficiently short wavelength (or equivalently, above a threshold frequency), the incident radiation is absorbed and the exposed surface emits electrons. This phenomenon is known as the photoelectric effect.
