Difference between Effect of intensity on photoelectric current and effect of frequency
The photoelectric effect has a unique attraction in quantum mechanics because it proves the particle nature of light. When the electromagnetic radiation are incident on the metal surface (Conductors) then a electron in a these material absorbs the energy from the photon and acquires more energy than its binding energy then it will ejected from the material in the form of photoelectrons. Electrons are ejected only when the frequency of the incident light is higher than a threshold value so it is necessary that the frequency of incident light is greater than the threshold frequency. If the photon energy is too low, the electron is unable to escape the material. Since an increase in the intensity of low-frequency light will only increase the number of low-energy photons, this change in intensity will not create any single photon with enough energy to eject an electron. The energy of the emitted electrons is not depend on the intensity of the incoming light of a given frequency, but it will depend only on energy of the individual photons. According to classical wave model of light the kinetic energy maximum is depends on light intensity. The maximum kinetic energy of the photoelectrons increases with higher frequency light. The current produced due to the ejected electrons is called photoelectric current.
Effect of intensity on photoelectric current |
Effect of frequency on the photoelectric current. |
1) The photoelectric current is linearly increased with the intensity of radiations.
2) The number of photoelctrons emitted is directly proportional to the incident radiations. 3) The maximum kinetic energy of the photoelectrons will not increases with higher intensity light. 4) The value of saturation current is depends on the intensity of radiation.
5) The intensity affect the kinetic energy of the emitted electrons. 6) The stopping potential will not negative for higher intensity. 7) According to classical wave model of light maximum kinetic energy is depend on light intensity.
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1) The photoelectric current is not linearly increased with the frequency.
2) The number of photo elctrons emitted is not directly proportional to the frequency of radiations. 3) The maximum kinetic energy of the photoelectrons increases with higher frequency light. 4) The value of saturation current is not depends on the frequency of radiation. 5) The maximum kinetic energy of the photoelectrons increases with higher frequency light. 6) The stopping potential will more negative for higher frequency. 7) According to quantum theory of light maximum kinetic energy is depend on light frequency only. |