A phototube is an evacuated glass tube with two electrodes (anode and cathode) t

Question

A phototube is an evacuated glass tube with two electrodes (anode and cathode) that face each other and a window. Light can be shined on the window, and the phototube can be placed in a simple circuit and used to study the photoelectic effect.

The "stopping voltage" in such an experiment is :

A. the positive voltage, or potential difference, between the cathode and anode that produces zero electron current.

B. the negative voltage, or potential difference, between the cathode and anode that produces zero electron current.

C. the current in the circuit when zero voltage, or potential difference, is applied between the cathode and anode.

Explanation / Answer

Answer is B.

to stop the electron (charge is negative) a negative voltage must be appled between the electrodes

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