Question

describe working of photoemission cell

Answer 1

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Photoemissive. Photoemissive cellsare are the oldest and most elaborate way of turning light into electricity. ... 1) Photoconductive—light increases the flow of electrons and reduces the resistance. 2) Photovoltaic—light makes electrons move between layers, producing a voltage and a current in an external circuit.

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Answer 2

Photoelectric cell or photocell is an electronic device which works on the principle of photo-electric effect and converts light energy into electrical energy.
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WORKING
The emitter is connected to negative terminal and collector is connected to positive terminal of a battery.
A radiation of frequency more than the threshold frequency of material of emitter is made incident on the emitter. Photo-emission takes place. The photo-electrons are attracted towards the collector which is positive w.r.t. the emitter, Thus current flows in the circuit.
If the intensity of incident radiation is increased the photoelectric current increases.