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Photoelectric Effect

A photocell c...

Question

A photocell converts light into electric signals. It is used in burglar alarms and for tapping light energy from the sun. Which metal is widely used in photocells?

A

Caesium

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B

Tungsten

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C

Sodium

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D

Silver-plated steel

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Solution

The correct option is A Caesium
Cesium metal is used extensively in photocells and in television cameras because it has very low ionization energy and is readily ionized by light.

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