What is the structure of a vacuum photocell?

The vacuum photocell consists of a glass bulb equipped with two electrical leads. The inner surface of the flask is covered with a thin metal layer with a low work function, which is the cathode. In the flask, helium to increase the sensitivity of the photocell. The light hits the cathode and knocks out the electrons; the anode in the form of a wire loop catches the ejected electrons. A current occurs in the circuit when light hits the photocell cathode.

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