The permanent electric dipole moment (PEDM) of hydrogen atom is calculated in classical mechanics and double-wave mechanics. The result of double-wave mechanics accords with the other result in classical limit. Because one wavefunction only describes an ensemble, the explanation to PEDM of hydrogen atom in orthodox quantum theory is difficult and unnatural. The classical mechanics and double-wave quantum mechanics could definitively describe single particle's action, and the calculations and explanations to PEDM in these two theories are more natural and reasonable.
Schrodinger's equation predicts something very peculiar about the electron in the Hydrogen atom: its total energy must be equal to zero. Unfortunately, an analysis of a zero-energy wavefunction for the electron in the Hydrogen atom has not been attempted in the published literature. This paper provides such an analysis for the first time and uncovers a few interesting facts, including the fact that a "zero-energy wavefunction" is actually a quantized version of the classical wavefunction that has been known for decades.