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 0.6 V and 18.0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then (a) the stopping potential will be 0.2 V (b) the stopping potential will be 0.6 V (c ) the saturation current will be 6.0 mA (d) the saturation current will be 2.0 mAA. the stopping potential will be `0.2V`B. the stopping potential will be `0.6V`C. the stopping potential will be `6.0V`D. the stopping potential will be `2.0V`

When a monochromatic point source of light is at a distance of 0.2 m f

1.	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 0.6 V and 18.0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then (a) the stopping potential will be 0.2 V (b) the stopping potential will be 0.6 V (c ) the saturation current will be 6.0 mA (d) the saturation current will be 2.0 mAA. the stopping potential will be `0.2V`B. the stopping potential will be `0.6V`C. the stopping potential will be `6.0V`D. the stopping potential will be `2.0V`
Answer» Correct Answer - B::D (b)Stopping potentail remains the same as it depends on the frequency of incident radiation. (D)Saturation current `alpha` intensity of incident radiation `a1/r^(2)`.Since `r` becomes three times `((0.6m)/(0.2m))`,saturation current becomes `(18.0mA)/(3)^(2)=2.0mA`

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