The constant of proportionality relating the energy of a photon to the frequency of that photon. Its value is approximately 6.626 × 10-34 joule-seconds.
[After Max Karl Ernst Ludwig PLANCK.]
Did you mean: Planck's constant (in physics), Planck's constant (quantum mechanics), Planck constant (radiation physics), Planck constant
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n. (Symbol h)
Columbia Encyclopedia:
Planck's constant
(plängks) , fundamental constant of the quantum theory. It is represented by the letter h and has a value of 6.63 × 10−34 J-sec. The combination h/2π, denoted by h (called “h-bar”), occurs frequently.
Science Dictionary:
Planck's constant
A universal constant, first discovered by Max Planck, that states the mathematical relationship between the frequency of an electromagnetic wave and the energy in that wave. Planck's discovery unifies the seemingly contradictory observations that energy sometimes acts like a wave and at other times acts as if it is made up of particles.
Unit Conversions:
Planck's constant
To convert from Planck's constant to:
erg-second,
multiply by 6.624E-27.
Did you mean: Planck's constant (in physics), Planck's constant (quantum mechanics), Planck constant (radiation physics), Planck constant
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/ Read more |
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| Science Dictionary. The New Dictionary of Cultural Literacy, Third Edition Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin. All rights reserved. Read more |
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| Unit Conversions. © 1999-2008 by Answers Corporation. All rights reserved. Read more |
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