On Sunday 22 March 2009 11:53:30 Stan Jakuba wrote: > There are three kinds of frequencies, and correspondingly three different > units: > > -- Angular Frequency, commonly called angular velocity. Its unit is rad/s. > > -- Cycle Frequency. It is defined as the number of periodic events (cycles) > per second. This unit was given the name hertz (in honor of the German > scientist), symbol Hz. > > -- Rotational Frequency, commonly called speed of rotation or simply speed. > Its unit is s-1 optionally written also as 1/s.
There is also frequency of radioactive decay, which is measured in becquerels. The becquerel is dimensionally equal to the hertz, but one measures periodic events, and the other random ones. Pierre
