NEET Questions Solved


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

(b) Stopping potential does not depend on the relative distance between the source and the cell.

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