Photoelectric effect

related topics
{math, energy, light}
{acid, form, water}
{style, bgcolor, rowspan}
{system, computer, user}
{@card@, make, design}
{work, book, publish}
{game, team, player}

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 visible or ultraviolet light. Electrons emitted in this manner may be referred to as "photoelectrons".[1][2] First observed by Heinrich Hertz in 1887,[2] the phenomenon is also known as the "Hertz effect",[3][4], although the latter term has fallen out of general use. Hertz observed and then showed that electrodes illuminated with ultraviolet light create electric sparks more easily.

The photoelectric effect requires photons with energies from a few electronvolts to over 1 MeV in high atomic number elements. Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave–particle duality.[1] Other phenomena where light affects the movement of electric charges include the photoconductive effect (also known as photoconductivity or photoresistivity), the photovoltaic effect, and the photoelectrochemical effect.

Contents

Full article ▸

related documents
Langmuir probe
Diffraction
Alpha Centauri
White dwarf
Speed of sound
Kuiper belt
Magnetosphere
Navier–Stokes equations
Cosmic ray
Saturn
Ionosphere
Pluto
Universe
Light pollution
Asteroid belt
Quasar
Gravitational lens
Magnet
Black body
Aberration of light
Potential energy
Lagrangian point
Centripetal force
Extrasolar planet
Lorentz force
Electromagnetic radiation
Thermodynamic temperature
Modified Newtonian dynamics
Kinematics
Nuclear magnetic resonance