The photocurrent may occur as a result of the photoelectric, photoemissive, or photovoltaic effect.
When a suitable radiation is used, the photoelectric current
- is directly proportional to intensity of radiation.
- increases with the increase in accelerating potential till the stage is reached when photo-current becomes maximum and does not increase with further increase in accelerating potential. The highest(maximum) value of the photo-current is called saturation current. The value of retarding potential at which photo-current becomes zero is called cut-off voltage or stopping potential for the given frequency of the incident ray.
- This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
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