Frequency Physics is incorrectly written, and should be written as a physical being its meaning frequency:
In physics, is called frequency, the number of oscillations of a wave and vibration, movement calculated in a temporary unit called hertz to the event that takes place once per second. If a second event is repeated two times will be two hertz, and so on. Adds the character of physics to the frequency of a wave to differentiate it from the meaning that represents the number of times that an event, also called absolute frequency occurs.