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- The threshold frequency is defined as the minimum frequency of the incident radiation below which photoelectric emission or emission of electrons is not possible. The threshold frequency refers to the frequency of light that will cause an electron to dislodge emit from the surface of the metal.
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Learn what threshold frequency is, how it relates to the photoelectric effect, and how to calculate it using Planck's constant and work function. Find out the applications and examples of threshold frequency in physics and chemistry.
- Work Function and Threshold Frequency
- Photons
- Work Function and Threshold Frequency Formula
- Steps For Photoemission from Metal Surfaces
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The emission of electrons with help of electromagnetic radiation like light from the surface of a photoelectric material is called the photoelectric effect. The electrons emitted are known as photoelectrons. The photoelectric threshold frequency is the minimum frequency of the electromagnetic rays which when strikes a surface, causes a photoelectri...
A photon can be defined as a quantum of light that carries energy proportional toradiationfrequency but has zero rest mass, and moves at the speed of light in thevacuum. Photons belong to the class of Boson and are elementary particles. The energy of light is considered to be quantized and hence, these small packets or quanta of energy are known as...
The first theory of the photoelectric effect was put forward by Einstein by using Max Planck’s theory of light energy. It was considered that each packet of light energy or photons carried energy hv where h was a proportionality constant known as the Planck constant and v was the frequency of the electromagnetic waves of light. Kmax is the maximum ...
The process of photoemission is a multistep process. These are: 1. The first step involves the striking of the electromagnetic radiation on the metal surface which causes the excitation of electrons. 2. The second step involves overcoming the energy barrier. The electrons impart the energy given to them by the photons. Or it can be said that the en...
Learn about the photoelectric effect, the minimum frequency of light that causes electrons to be emitted from a metal surface, and the formula for calculating the work function and kinetic energy of photoelectrons. Explore the applications of photoelectric threshold frequency in devices such as photomultipliers, photoelectron spectroscopy, night vision, and image sensors.
Learn about the photoelectric effect, the minimum frequency and wavelength of light required to emit photoelectrons, and the work function of a metal. Find definitions, equations, examples, and exam tips for AQA A Level Physics.
Learn how Einstein used Planck's quantum theory to explain the photoelectric effect, which is the emission of electrons from a metal surface by light. Find out the threshold frequency, the maximum kinetic energy, and the applications of photoelectric effect.
- 17 min
- J J Thomson discovered electron.
- Alkali metal is usually used for exhibiting photoelectric effect. Metals such as copper and sodium are examples of metals that exhibit photoelectri...
- Ultraviolet light is the type of light that is needed to cause the photoelectric effect.
- The applications of photoelectric effect are electric eye in door openers, light meters in photography, photostatic copying, and solar panels.
Learn the definition, equation and graph of threshold frequency and wavelength for the photoelectric effect. See a worked example and exam tip for CIE A Level Physics.
Learn how to use Einstein's photoelectric equation to solve problems on photoelectric effect. Find the threshold frequency of a metal given the frequency and kinetic energy of light.
- 9 min
- Mahesh Shenoy
The scientists observed that if the incident light had a frequency less than a minimum frequency ν 0 , then no electrons were ejected regardless of the light amplitude. This minimum frequency is also called the threshold frequency, and the value of ν 0 depends on the metal.
