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What is Retarding Voltage?


jeheron

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I have recently started studying the photoelectric effect. I currently have very little understanding of the theory. As i understand it retarding voltage is a voltage applied to the anode and the cathode of a photovoltaic cell such that any photoelectrons emitted are decelerated just enough such that they don’t reach the anode.

 

This is a very superficial understanding, and could be totally wrong. Can anyone help me qualitatively refine my understanding?

 

Also, why is a retarding voltage ever used?

 

Jack.

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