Поиск

Полнотекстовый поиск:
Где искать:
везде
только в названии
только в тексте
Выводить:
описание
слова в тексте
только заголовок

Рекомендуем ознакомиться

Остальные работы->Реферат
It was made up of the serfs and peasants that left the feudal system in search of making money in trade. For the middle class, the king granted Charte...полностью>>
Остальные работы->Реферат
But industry cause major environmental problems to the ocean. There are safe practices to using pesticides that would reduce if not eliminate the prob...полностью>>
Остальные работы->Реферат
An interesting individual, by the name of Lawrence Kohlberg, came up with a fascinating way of looking at morality in our society. This man originated...полностью>>
Остальные работы->Реферат
Seinfeld ranks among the best situational comedies of all time. It has been compared to I Love Lucy and The Honeymooners, both of whom received praise...полностью>>

Главная > Реферат >Остальные работы

Сохрани ссылку в одной из сетей:

Photoelectric Effect Essay, Research Paper

Photoelectric Effect

Photoelectric Effect is the formation and liberation of electrically charged particles in matter, usually metals, when it is irradiated by light or other electromagnetic radiation. The term photoelectric effect designates several types of interactions. In the external photoelectric effect, electrons are liberated from the surface of a metallic conductor by absorbing energy from light shining on the metal’s surface. This is the form that we generally associate photoelectric effect with.

Study of the external photoelectric effect played an important role in the development of modern physics. Experiments beginning in 1887 showed that the external photoelectric effect had certain qualities that could not be explained by the theories of that time, in which light and all other electromagnetic radiation was considered to behave like waves. For example, as the light shining on a metal becomes increasingly intense, the classical wave theory of light suggests that the electrons that absorb the light will be liberated from the metal with more and more energy. However, experiments showed that the maximum possible energy of the ejected electrons depends only on the frequency of the incident light, and is independent of the light’s intensity.

In 1905, in an effort to explain how the external photoelectric effect occurs, Albert Einstein suggested that light could be considered to behave like particles in some instances, and that the energy of each light particle, or photon, depends only on the wavelength of the light. To explain the external photoelectric effect, he envisioned light as a collection of projectiles hitting the metal. A free electron in the metal that is struck by a photon absorbs the photon’s energy. If the photon is energetic enough, the electron is ejected from the metal. Einstein’s theory explained many features of the external photoelectric effect, including why the maximum energy of electrons ejected from a metal is independent of the intensity of the light itself. Einstein’s theory was later verified through further experimentation. His explanation of the photoelectric effect, with its demonstration that electromagnetic radiation can behave like a collection of particles in some situations, contributed to the development of quantum theory.

*Much of this information comes from Encarta Encyclopedia s Photoelectric Effect listing.


Загрузить файл

Похожие страницы:

  1. The Photoelectric Effect Essay Research Paper The

    Реферат >> Остальные работы
    ... photochathode surface provided . Three filters each having a distinct wavelength, were used ... used to calculate frequency for each wavelength utilizing the equation f = c/l. ... . These results according to the photoelectric effect are in agreement with Einstein ...
  2. Photoelectric Effects Essay Research Paper Introduction TheQuantum

    Реферат >> Остальные работы
    ... threshold frequency varies with each metal. When the sodium ... the photoelectric effect contradicts the Wave Theory. In the photoelectric effect only ... The energy contained in each photon depends on the ... be liberated and the excess energy becomes the kinetic ...
  3. Television 2 Essay Research Paper Did you

    Реферат >> Остальные работы
    Television 2 Essay, Research Paper Did you know ... , Joseph May, discovered the photoelectric effect: selenium bars, exposed to ... simultaneously: a large number of photoelectric cells are arranged on a ... image is thrown onto a photoelectric mosaic fixed to one of ...
  4. How Tv As Evolved Essay Research Paper

    Реферат >> Остальные работы
    ... Tv As Evolved Essay, Research Paper Did you know ... Joseph May, discovered the photoelectric effect: selenium bars, exposed to ... simultaneously: a large number of photoelectric cells are arranged on a ... image is thrown onto a photoelectric mosaic fixed to one of ...
  5. Albert Einstien Essay Research Paper Men and

    Реферат >> Остальные работы
    Albert Einstien Essay, Research Paper Men and Women of ... this interpretation to explain the photoelectric effect, by which certain metals ... 1905 work on the photoelectric effect. With the rise of ... have abandoned original scientific research, Einstein and his co ...

Хочу больше похожих работ...

Generated in 0.0027182102203369