1.(fysiikka)kvanttiteorian perusta, jonka mukaan sähkömagneettisten aaltojen energia on jakamattomissa kvanteissa
1.(physics) the basis of quantum theory; the energy of electromagnetic waves is contained in indivisible quanta that have to be radiated or absorbed as a whole; the magnitude is proportional to frequency where the constant of proportionality is given by Planck's constant