In many cases, engineers can get by with relatively simple empirical models to describe devices that depend on quantum mechanics to actually work. (Case in point: permanent magnets, which, according to classical electrodynamics, really shouldn’t be able to exist.)
In many cases, engineers can get by with relatively simple empirical models to describe devices that depend on quantum mechanics to actually work. (Case in point: permanent magnets, which, according to classical electrodynamics, really shouldn’t be able to exist.)