When a monochromatic point source of light is at a distance of `0.2` m from a photoelectric cell, the cut off voltage and the saturation current are respectively `0.6V` and `18.0 mA` if the same source is placed `0.6 m` away from the photoelectric cell , then
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Cut-off voltage independent of intensity ` l oo (1)/(d^(2))` 0.6 volt , 2 mA
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