We talk about quantum states — that is, something can be at one of several discrete values but not in between. For example, a binary digit can be a 1 or a 0, but not 0.3 or 0.5. Atoms have quantum ...

The Franck–Hertz experiment was a pioneering physics observation announced in 1914 which explained that energy came in “packets” which we call “quanta”, marking the beginning of quantum physics.

In honor of Heinrich Hertz’s birthday, Google put up a doodle on its search page today honoring the German physicist whose research led to the wireless telegraph, radio, radar, and broadcast TV. Today ...