According to the notes and the graph, how does stopping potential change when the intensity of incident light is increased while keeping frequency fixed above threshold? 
AIt increases linearly
BIt decreases linearly
CIt remains unchanged
DIt first increases and then decreases
Answer & Solution
Correct answer: C. It remains unchanged
Stopping potential depends on the maximum kinetic energy of emitted electrons, and that depends on frequency, not intensity. Increasing intensity increases the number of emitted electrons, but not their maximum kinetic energy. Hence the stopping potential remains unchanged.
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