( Quantum level University Physics III - Optics and Modern Physics (OpenStax) )
● 11: Particle Physics and Cosmology
Maths is fun
https://www.mathsisfun.com/algebra/directly-inversely-proportional.html
Physics
https://courses.lumenlearning.com/suny-physics/
https://www.sciencedirect.com/referencework/9780122274107/encyclopedia-of-physical-science-and-technology