photo electric effect is maximum in
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Explanation:
The photo electric effect is maximum in Cs as it has the lowest first ionization energy among alkali metals.On moving down the group of alkali metals, the ionization energy decreases and the removal of the electron becomes easy.
Caesium is the last element in the alkali metal group. Therefore, the ionisation potential of Caesium is less compared to the other metals and when it is subjected to electromagnetic radiation, the electrons are emitted or ejected easily than other metals in the group. Hence, photoelectric effect is maximum in Cs.
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