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# The number of photoelectrons emitted for light of a frequency $v$ (higher than the threshold frequency ${v_o}$) is proportional to:

Last updated date: 22nd Jul 2024
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Hint: Photoelectrons are the electrons that are generated when an energetic photon of radiation hits a particle, and the photoelectron distribution is determined by analysing the range of energies that they possess.

The photoelectric effect occurs as light shines on a metal and causes electrons to be expelled from the metal's surface. Photoemission is another name for this method, and photoelectrons are the electrons that are ejected from the metal. Photoelectrons behave and behave like other electrons in terms of action and properties. The prefix photo- literally indicates that incident light has ejected electrons from a metal surface.
The following observations were obtained as studies were conducted to look at the influence of light intensity and wavelength.
Photoelectrons' kinetic energy rises as light frequency rises.
As the frequency of light changes, the electric current remains stable.
The amplitude of light causes an increase in electric current.
As the amplitude of light increases, the kinetic energy of photoelectrons remains stable.
The number of photoelectrons released is directly proportional to the amount of light that is emitted.
The photo current is determined by the number of photo electrons. The number of photoelectrons depends on the strength of light, assuming that the number of electrons released is proportional to the number of photons incident.

Note: Physicists expected that increasing light intensity would increase the kinetic energy of released photoelectrons, while increasing frequency would increase measured current, based on the wave model of light.
Experiments found that increasing the light frequency increased the photoelectrons' kinetic energy, while increasing the light intensity increased the current, contrary to expectations.
Einstein suggested that light acted as a stream of particles called photons with an energy of E = h $v$ based on these results.