Question

Photoelectric effect is not observed in case of:

A

potassium

B

rubidium

C

magnesium

D

cesium

Medium
Solution
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Correct option is C)

When light is exposed to a clean metallic surface, electrons are ejected from the surface. This phenomenon is known as the photoelectric effect.
 A minimum energy is required for the emission of photoelectrons, which is called threshold energy or work function. 
This phenomenon is generally observed for elements for which the threshold energy required is low or in other words, the atoms that have low ionization potential.
 For this reason, only the group I elements in the periodic table exhibit this behavior. So, Mg does not show photoelectric effect.

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