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State how in a photo-cell, the work func...

State how in a photo-cell, the work function of the metal influence the kinetic energy of the emitted electrons.
(a) If the intensity of the incident radiation is doubled, what change occur in (i) the stopping potential and (ii) in photoelectric current?
(b) If the frequency of the incident radiation is doubled, what changes occur in the (i) stopping potential and (ii) photoelectric current.

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