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 Form 4 Physics Photoelectric effect online video lessons

What is photoelectric effect?

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Answer Text:
PHOTOELECTRIC EFFECT
-Photoelectric effect was discovered by Heinrich Hertz in 1887. Photoelectric effect is a phenomenon in which electrons are emitted from the
surface of a substance when certain electromagnetic radiation falls on it. Metal surfaces require ultra-violet radiation while caesium oxideneeds a visible light i.e. optical spectrum (sunlight).


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