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Why are potassium and caesium, rather th...

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

A

Because of their lower IE

B

Because of their lower EA

C

Because of their higher IE

D

Both (1) and (2)

Text Solution

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The correct Answer is:
A
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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.