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Which of the following is used in photoelectric cells?
(a) Na (b) K (c) Li (d) Cs

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Reveal Chemystery with 2 years teaching experience in engineering college

Cs is used in the photoelectric cell due to the lowest ionization enthalpy among all alkali metals.
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Answer is option (d) Explanation: Alkali metals have low ionatisation entalpies and among Li,Na,K,Rb, Cs metals Cs will have very low ionisation enthalpies so we can easily eject the electron by using the light
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Tutor

Cs (ceiSium) is used in photo electric cell
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Li
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Cs
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Cs is used due to its low ionisation energy .
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Trainer

d) Cs, due to biggest size lowest ionization enthalpy
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home tution

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Cesium
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Cs
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