Laws of photo electric effect & applications of photo electric effect

The Photoelectric Effect is a phenomenon where electrons are emitted from a material when it absorbs electromagnetic radiation, such as light.

LAWS OF PHOTOELECTRIC EFFECT

Laws of Photoelectric Effect:

  • The number of electrons emitted from a material is directly proportional to the intensity of the light incident on it.
  • The energy of the emitted electrons is determined by the frequency of the light, not its intensity. 
  • Electrons with higher energy correspond to light of higher frequency.

Applications of Photoelectric Effect:

  • Solar cells - Photoelectric effect is used to generate electricity in solar cells.
  • Photo detectors - The photoelectric effect is used in devices like photodiodes, phototransistors, and photomultipliers to detect light and convert it into an electrical signal.
  • Spectroscopy - The photoelectric effect is used in spectroscopy to measure the frequency of light and determine the composition of a sample.
  • Sensors - The photoelectric effect is used in sensors to detect light and trigger an action, such as automatically turning on lights in a room.