First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment o<answer>f</answer> energy, E, o<answer>f</answer> a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the <answer>f</answer>requency, <answer>f</answer>, o<answer>f</answer> its associated electromagnetic wave. In 1905 the value E, the minimal energy increment o<answer>f</answer> a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element o<answer>f</answer> the energy o<answer>f</answer> the electromagnetic wave itsel<answer>f</answer>. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.
What is frequency also known as in science?
f