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Light of certain frequency and intensity incident on a photosensitive material causes the photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes

Light of certain frequency and intensity incident on a photosensitive material causes the photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes Correct Answer doubled

CONCEPT:

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Photoelectric Effect:

  • When the light of a sufficiently small wavelength is incident on the metal surface, electrons are ejected from the metal instantly. This phenomenon is called the photoelectric effect.​

Laws of Photoelectric Effect:

  1. For a light of any given frequency; (f > fTh) photoelectric current is directly proportional to the intensity of light
  2. For any given material, there is a certain minimum frequency, called threshold frequency, below which the emission of photoelectrons stops completely, no matter how high is the intensity of incident light.
  3. The maximum kinetic energy of the photoelectrons is found to increase with the increase in the frequency of incident light, provided the frequency (f > fTh) exceeds the threshold limit. The maximum kinetic energy is independent of the intensity of light.
  4. The photoelectric emission is an instantaneous process without any apparent time lag (10-9 sec or less), even when the intensity of the incident radiation is made extremely low.​

EXPLANATION:

  • By increasing the intensity of incident light on the surface, the photoelectric current first increases due to an increase in accelerating potential. The current can reach a maximum value called Saturation current.
  • Beyond this value, the photoelectric current starts decreasing because of the saturation and falls to zero value.
  • From the above-given explanation, we know that if both frequency and intensity of light are doubled it means that because of an increase in frequency the kinetic energy of emitted photo-electron will be doubled but the number of photo-electrons will not increase.
  • Whereas because of an increase in the intensity of light there will be more photons that produce twice the initial amount of photo-electrons produced
  • Hence only because of intensity, the saturation current will become double.

Related Questions

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