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When a point source of light is at a dis...

When a point source of light is at a distance of one metre from a photo cell , the cut off voltage is found to be `V`. If the same source is placed at `2 m` distance from photo cell , the cut off voltage will be

A

V

B

V/2

C

V/4

D

`V//sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
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