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Dictionary

Planck's' con'stant

Physics.
the fundamental constant of quantum mechanics, expressing the ratio of the energy of one quantum of radiation to the frequency of the radiation and approximately equal to 6.624 × 10-²⁷ erg-seconds. Symbol: h Also,Planck' con"stant.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Planck

Planck's radiation law

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