Question

How is the photoelectric effect used in everyday life?

Answer 1

Hint: The phenomenon by which the metals release electrons when exposed to the light of appropriate wavelength is termed as photoelectric effect. There are various applications in everyday life where the photoelectric effect is applied.

Complete step by step answer:
The photoelectric effect is defined as the phenomenon where the electrons are ejected from the surface of the metal when an incident light hits the metal surface. The electrons which are ejected are known as photoelectrons. The emission of the photoelectrons and the kinetic energy of the ejected photoelectrons is based on the frequency of the incident light on the surface of metal.
The process by which the photoelectrons are ejected from the metal surface by the action of incident light is known as photoemission.
The photoelectric effect is observed because the electrons present on the surface of the metal absorb energy from the incident light and apply it to overcome the attractive force which binds the electrons in the metal nuclei.
There are various applications of photoelectric effect in everyday life. The phenomenon of photoelectric effect is used to generate electricity with the help of solar panels. The solar panel contains metal which helps to generate electricity by releasing energy when the light hits the metal. Another application of photoelectric effect is that is used in digital cameras as it can detect and record light due to the presence of photoelectric sensors which respond to different colors of light. Lightning sensors used in smartphones help to automatically adjust the brightness according to lighting.

Note: The photoelectric effect is affected by the intensity of the incident radiation, the potential difference between the metal plate and the collector and the frequency of the incident light.