what are photoelectric effect substances? how does they ionise electromagnetic rays?
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Answer:
Explanation:
Photoelectric effect
PHYSICS
WRITTEN BY: The Editors of Encyclopaedia Britannica
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Alternative Title: photoemission
Photoelectric effect
QUICK FACTS
KEY PEOPLE
Albert Einstein
Robert Millikan
Philipp Lenard
RELATED TOPICS
Electromagnetic radiation
Photoconductivity
Photo-ionization
Einstein relation
Photoelectric absorption
Photoelectron
Photoelectric work function
Photoelectric threshold frequency
Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it. In a broader definition, the radiant energy may be infrared, visible, or ultraviolet light, X rays, or gamma rays; the material may be a solid, liquid, or gas; and the released particles may be ions (electrically charged atoms or molecules) as well as electrons. The phenomenon was fundamentally significant in the development of modern physics because of the puzzling questions it raised about the nature of light—particle versus wavelike behaviour—that were finally resolved by Albert Einstein in 1905. The effect remains important for research in areas from materials science to astrophysics, as well as forming the basis for a variety of useful devices.
Answer:
When electromagnetic radiation interacts with an atom, iteither excites electrons to a higher energy level known as an excited state, or, if the energy of the light is sufficiently high, it can ionize the atom by removing the electron.
Explanation:
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