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:
- 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.