Chapter Name : Dual Nature Of Radiation And Matter |
Sub Topic Code : 101_12_11_03_02 |
Topic Name : Photoelectric Effect |
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Sub Topic Name : Hallwachs' And Lenard's Observations |
In the photoelectric effect, electrons are emitted from matter (metals and non-metallic solids, liquids or gases) as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as ultraviolet radiations.
Photoelectric effect
Video camera and digital cameras work by the principle of photo electric effect.
What is electron emission ?
Key Words | Definitions (pref. in our own words) |
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Photoelectric effect | The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to the incident light. |
Gadgets | How it can be used |
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Video camera | Video camera tubes in the early days of television used the photoelectric effect. |
Digital cameras. A photon hits the sensor, liberating an electron which is then measured by the camera.
Studios
Examples | Explainations |
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Garden | Various plants absorb nutrients and water. |
The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to the incident light.
It was found that certain metals like zinc, cadmium, magnesium, etc. responded only to ultraviolet light having short wavelength, to cause electron emission from the surface.
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