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100 lessons,
4h 52m
What is Photoelectric effect?
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In this video learn about the photoelectric effect, who first discovered it and other interesting facts about this phenomenon.

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FirstlyThank you mam for your effort. These bytes Videos are really Helpful. I would request you to make gist on- diseases in Human Beings as a part of Science and Tech. In one week you can take one disease if possible.
first of all thanx..and secondly plz explain about night vision cameras which uses photoelectric's working...
could you change the speaker?
please explain "el nino"
El nino please! This is my 4th request by the by!
  1. Photoelectric Effect

  2. The effect is based on the idea that electromagnetic radiation is made of a series of particles called photons. When a photon hits an electron on a metal surface, the electron can be emitted.

  3. The emitted electrons are called photoelectrons. The effect is also called the Hertz Effect, because it was discovered by Heinrich Rudolf Hertz but this name is not used often.

  4. Albert Einstein proposed the Laws of Photoelectric Effect and Won the Nobel Prize for Physics in 1921.

  5. Not every electromagnetic wave will cause the photoelectric effect, only radiation of a certain frequency or higher will cause the effect. The minimum frequency needed is called Frequency (v)he cut-off frequency or threshold frequency

  6. Energy of electrons vs frequency of light (for photoelectric cell) E=hf = KE + w. x-intercept is threshold frequency Where, h is Planck's constant, 0f is the frequency of the electromagnetic wave KE is the kinetic energy of the photoelectron w is the work function for the metal -1 gradient the Planck conjtant -2 y-intercept is work function

  7. Compton scattering Recoil electron Target electron at rest If the photon has a lot of energy, Compton scattering or pair Incident photon te Scatteredproduction may take photonplace. -_-(1-cos moc