Question

what is photo electric effect in chemistry with diagram to explain

Answer 1

The photoelectric effect is the emission of electrons or other free carriers when light shines on a material. Electrons emitted in this manner can be called photo electrons. This phenomenon is commonly studied in electronic physics, as well as in fields of chemistry, such as quantum chemistry or electrochemistry.

Answer 2

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.