Q.

Pick the wrong statement of the following.

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a

Photoelectric current increases with increase in accelerating potential until it becomes maximum value.

b

High voltage spark passed across electrodes in a discharge tube if they are illuminated by ultraviolet light.

c

To study the effect of potential on photo-electric current, we first maintain collector at positive potential with respect to emitter.

d

The maximum negative potential given to collector for which photoelectric current becomes zero is  called stopping potential.

answer is D.

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Detailed Solution

The stopping potential is the minimum negative potential applied to collector w.r.t emitter for which photocurrent becomes zero
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