知识
i)Lightisanelectromagneticwavethatisactuallycomprisedofdiscretepacketsofenergy.
ii)Matteriscomprisedofdiscreteparticlesthatexhibitawavelikenature.
iii)Everything—lightandmatter—hasan“intrinsicangularmomentum,”or“spin,”thatcanhaveonlydiscretevalues.
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