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Thermionic Emission and Radioactivity — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsThermionic Emission and Radioactivity1 Mark
Question
How is a zinc sulphide screen affected when a cathode ray beam strikes it?
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Answer

When a cathode ray beam strikes a zinc sulphide screen, a bright spot is seen on the screen.

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