Assertion: atom's energy | /r/Synonym | photon
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Source sentences:
text: Planck had theorized that electromagnetic radiation , such as light, occurs in discrete bundles, or “ quanta ,” of energy now known as photons .
text: In 1905, Einstein proposed an explanation of the photoelectric effect using a concept first put forward by Max Planck that light waves consist of tiny bundles or packets of energy known as photons or quanta.