The sketch shows how the current detected by a photocell circuit varies with the potential difference applied across the plates.
a) Explain why the current is zero at the stopping potential. (2)
b) Explain why the current increases to a maximum? (2)
Answers
a) no electrons make it to the opposite plate because they are repelled by the negative charge
b) light intensity is constant so the number of photons is constant this means the number of electrons produced per second is constant
i.e. the maximum current
#photoelectric #quantumphysics #maths #electrons #physics
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