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When the light source is kept 20 cm away...

When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be

A

0.3 V

B

0.6 V

C

1.2 V

D

2.4 V

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The correct Answer is:
B
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