Photo electric effect is not obsereved in case of
Answers
Answer:
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.
PLZ MAKE MY ANSWER AS BRAINLEST PLZ
Photoelectric effect
It is the phenomenon of ejection of electrons by certain metals (like potassium, rubidium, caesium etc.) when light of suitable frequency incident on them. The electrons ejected are called photoelectrons. This phenomenon was first observed by H.Hertz. The important characteristics of photoelectric effect are:
1. The electrons are ejected from the metal surface as soon as the beam of light strikes the surface. i.e., there is no time lag between the striking of light beam and the ejection of electrons from the metal surface.
2. The number of electrons ejected is proportional to the intensity or brightness of light.
3. For each metal, there is a minimum frequency (known as threshold frequency ) below which photoelectric effect is not observed.
4. The kinetic energy of the ejected electrons is directly proportional to the frequency of the incident light.