The cutoff potential is a function of
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The negative potential of the plate 'C' at which the photo electric current becomes zero is called stopping potential or cut-off potential. Stopping potential is that value of retarding potential difference between two plates which is just sufficient to halt the most energetic photo electrons emitted.
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The minimum negative potential applied to the anode for which the photocurrent stops or becomes zero is called cut-off or stopping potential.
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