Photocathode
[foh-toh-kath-ohd] /ˌfoʊ toʊˈkæθ oʊd/
noun
1.
a , typically of a cesium or sodium compound, having the property of emitting electrons when activated by light or other radiation.
/ˌfəʊtəʊˈkæθəʊd/
noun
1.
a cathode that undergoes or is used for photoemission
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