Asked by | 26th Apr, 2008, 09:27: PM
The photoelectric effect is a phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x-rays or visible light.The emitted electrons can be referred to as photoelectrons
Laws of photoelectric emission
- For a given metal and frequency of incident radiation, the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.
- For a given metal, there exists a certain minimum frequency of incident radiation below which no photoelectrons can be emitted. This frequency is called the threshold frequency.
- Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron is independent of the intensity of the incident light but depends on the frequency of the incident light.
- The time lag between the incidence of radiation and the emission of a photoelectron is very small, less than 10-9 second.
Answered by | 23rd May, 2008, 12:35: PM
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