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11. Dual nature of radiation and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
A photocell employs photoelectric effect to convert
  • A
    change in the frequency of light into a change in the electric current
  • B
    change in the frequency of light into a change in electric voltage
  • ✓
    change in the intensity of illumination into a change in photoelectric current
  • D
    change in the intensity of illumination into a change in the work function of the photocathode.
✓

Answer

Correct option: C.
change in the intensity of illumination into a change in photoelectric current
c
The photoelectric current is directly proportional to the intensity of illumination. Therefore a change in the intensity of the incident radiation will change the photocurrent also.

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