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Statement-1: Potassium and caesium are u...

Statement-1: Potassium and caesium are used in photo-electric cells.
Statement-2: Potassium and caesium emit electrons on exposure to light above certain minimum frequency.

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Discuss why potassium and caesium are used in photoelectric cells.

Why are potassium and caesium, rather lithium used in photoelectric cells?

Why are potassium and caesium, rather lithium used in photoelectric cells?

Why are potassium and caesium, rather than lithium used in photoelectric cells ?

Why are potassium and caesium, rather than lithium used in photoelectric cells?