0 Members and 1 Guest are viewing this topic.
As a dimensionless number, it is even more fundamental than other constants such as the strength of gravity, the speed of light or e itself.
The fine structure constant is the ratio between the velocity of the electron in the Bohr model of the atom and the speed of light. The square of alpha; is the ratio between the electron rest mass (511 keV) and the Hartree energy (27.2 eV = 2 Ry).# In the theory of quantum electrodynamics, the fine-structure constant is the coupling constant for the strength of the interaction between electrons and photons. The theory does not predict its value; thus it must be determined experimentally. In fact, it is one of the 20-odd 'external' parameters in the Standard Model of particle physics.
In an article I'm reading about measuring the fine structure constant it states:QuoteAs a dimensionless number, it is even more fundamental than other constants such as the strength of gravity, the speed of light or e itself. Why is a dimensionless number more fundamental? (layman's terms if possible, please)