1.

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    [MP PMT 1994]

A.            0.3 V                                        
B.            0.6 V
C.            1.2 V                                        
D.            2.4 V
Answer» C.            1.2 V                                        


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