Electrons in atoms only have discrete energy levels.
Why? How does the transition go?
The following article explains this with Quantum Theory. It is about Planck and spin. (Keep in mind: h-bar = h/2π).
The SI-units are being unified. The speed of light becomes 1.
With Fredkin’s hypothesis and the ‘Uncertainty principle’ the authors deduce the quantum of space and time and mass-energy.
An experiment is proposed (different photons must differ a minimum multiple) to prove that all these quanta indeed are equal to natural h-bar/2.