  In this paper, we demonstrate novel relationships between quantum mechanics
and the electromagnetic wave equation. In our approach, an invariant
interference-dependent electromagnetic quantity, which we call "quantum rest
mass", replaces the conventional role of the inertial rest mass. In the ensuing
results, photons, during interference, move slower than the speed of light in
vacuum, and possess de Broglie wavelength. Further, we use our electromagnetic
approach to examine double-slit photon trajectories, and to arrive at the
Schrodinger equation's results for a particle in an infinite square well
potential.
