... photoelectrons) 3. Explain the dependence between photocurrent and the potential difference existing between a cathode and an anode. When the positive potential difference increases, the photocurrent reaches a point of saturation, due to limited number of photocurrent ejected from the cathode at a given light intensity --> the bigger light intensity I is, the bigger is the value of point of saturation --> question no 2. When the potential difference approaches 0, the photocurrent decrease. (Fig.5.3) 4. What is a stopping potential? It is certain negative potential of the anode necessary to cause a photocurrent decay. It is create by changing the polarity of voltage. It is the only way to stop the photoelectrons. The low positive potential of the anode is conductive to the formation of a cloud of photoelectrons at the cathode, which inhibits the movement of photoelectrons towards the anode but DON'T STOP THEM. Even when the potential difference equal ...

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