+Planck's Law describes the spectral radiance of electromagnetic radiation emitted by a [black body](/wiki/black_body) in thermal equilibrium at a given temperature. It fundamentally introduced the concept that energy is not continuous but emitted in discrete packets, or [quanta](/wiki/quanta), thereby laying the bedrock for quantum theory.
+## See also
+- [Quantum Theory](/wiki/quantum_theory)
+- [Photon](/wiki/photon)
+- [Wien's Law](/wiki/wiens_law)
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