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Wave Optics

Question
CBSEENPH12040092
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A photo-cell employs photoelectric effect to convert

  • change in the frequency of light into a change in electric voltage

  • change in the intensity of illumination into a change in photoelectric current

  • change in the intensity of illumination into a change in the work function of the photocathode

  • change in the frequency of light into a change in the electric current

Solution

B.

change in the intensity of illumination into a change in photoelectric current

In photoelectric effect when monochromatic radiations of suitable frequency fall on the photo-sensitive plate called cathode, the photoelectrons are emitted which get accelerated towards anode. These electrons flow in the outer circuit resulting in the photoelectric current.
Using the incident radiations of a fixed frequency, it is found that the photoelectric current increases linearly with the intensity of incident light as shown in figure. Hence, a photocell employs photoelectric effect to convert change in the intensity of illumination into a change in photoelectric current.

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