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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.

PlanckPlanck's radiation law
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