When a monochromatic point source of light is at a distance of \( 0...

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When a monochromatic point source of light is at a distance of \( 0.2 \mathrm{~m} \) from a photoelectric cell, the cut-off voltage and the saturation current are respectively \( 0.6 \mathrm{~V} \) and \( 18 \mathrm{~mA} \). If the same source is placed \( 0.6 \mathrm{~m} \) away from the cell, then :
(A) the stopping potential will be \( 0.2 \mathrm{~V} \)
(B) the stopping potential will be \( 1.8 \mathrm{~V} \)
(C) the saturation current will be \( 6.0 \mathrm{~mA} \)
(D) the saturation current will be \( 2.0 \mathrm{~mA} \)
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