Frequency (cycle speed) is measured in the units called "hertz," named after a person.

1 Hertz = 1 Cycle per second, but usually we just abbreviate this to 1/s (1 over second).

It's used in the physics of sound, as well as electrical engineering - probably in mechanical engineering, too.

The X axis on the google doodle denotes time, t. The Y axis is some function of the sine or cosine of the t value.

A simple example is something like Y = A*sin(B*t + C)
The example given in the doodle has a variable frequency.

Last edited by TheFallibleFiend; 02/22/12 07:42 PM.