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It is shown that all of the basic properties of the hydrogen atom can be consistently described in terms of classical electrodynamics if the Schrödinger equation is considered to be the field equations similar to Maxwell equations for the electromagnetic field. In the framework of classical electrodynamics, the nonlinear Schrödinger equation is derived, which completely describes the spontaneous emissions of an atom, the thermal radiation and the light-atom interaction. The Planck’s law for the spectral energy density of thermal radiation and the Einstein A-coefficient for spontaneous emission are derived in the framework of classical field theory without quantization of radiation. It is shown that three well-known laws of the photoelectric effect can also be derived within classical field theory.