Hydrodynamic model of photon emission and absorption

The wave/particle nature of the photon is explained as a wave motion in an elastic string or filament with axial tension T = μc ² and constant linear mass density μ such that the speed of wave propagation is c, the speed of light in a vacuum. The string must link an excited potential emitter atom with a potential absorber atom in a lower level stationary state. A string with the necessary properties has been described in a previous article in Physics Essays. There are two types of strings. The first type is an internal ether string of low linear mass density linking the core of a shell electron with the core of the positron which was added to the neutron to form the proton during beta decay. The second type is an external ether string of large linear mass density linking an electron in the proton in the nucleus of a potential emitter atom with a positron in a proton in the nucleus of a potential absorber atom. Because the linear mass density of the external ether strings is much larger than that of an internal ether string, nearly 100% of the energy in a traveling wave on an internal ether string is reflected back toward the shell electron and only a small fraction is transmitted through the gas positron to the external ether strings in the form of very low amplitude. Equations are derived for the lifetime of stationary states and the wave patterns containing the energy of a photon involving the beat frequency generated by the superposition of two waves of different frequency on the same external ether string.