When a monochromatic point-source of light is at a distance of 0.2 m from a photo-electric cell, thecut-off voltage and the saturation current are respectively 0.6 V and 18’0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then

 When a monochromatic point-source of light is at a distance of 0.2 m from a photo-electric cell, the
cut-off voltage and the saturation current are respectively 0.6 V and 18'0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then

  1. A

     the stopping potential will be 0 2 V

  2. B

     the stopping potential will be 0'6 V

  3. C

    the saturation current will be 6'0 mA

  4. D

     the saturation current will be 3'0 mA

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    Solution:

     Stopping potential depends on the wavelength of  incident radiation. It is independent of the distance
    between the source and photoelectric cell. intensity of illumination varies inversely as the square of distance.

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