Question

which type of element is used in Photoelectric effect give two examples

Answer 1

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here is your answer..
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Alkali metals are most suited for demonstration of photoelectric effect since they have the lowest work function of all..
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Low work function metal metal such as caesium. Sodium ,potassium is used since less energy is required for removal. therefore photoelectric current will be more
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Answer 2

all alkali metals including cesium aluminium etc