When A Point Source Of Light Is At A Distance Of 50 Cm From A Photoelectric Cell, The Cut-off Voltage Is Found To Be V0. If The Same Source Is Placed At A Distance Of 1 M From The Cell, The Cut-off Voltage Will Be 

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Question

When a point source of light is at a distance of 50 cm from a photoelectric cell, the cut-off voltage is found to be V0. If the same source is placed at a distance of 1 m from the cell, the cut-off voltage will be 

Solution

Correct option is

When the distance of the source from the cell is increased, the intensity of light falling on the cell decrease; but the cut-off voltage of the cell is independent of the intensity of the incident radiations.

Testing

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