Seattle Sounders gaining ground in MLS power ranks after Vancouver win Tue Sep 22, 2015 | espnfc.us The Sounders make a big move in this week's rankings, thanks to an emphatic win on the road against the first-place Whi...
In a normal EEG the frequencies are predominately within the range of alpha and beta rhythms at the rate of 8 to 30 hertz (cycles per second). During sleep the brain cells generate higher voltage electrical waves, but the rhythm is slowed down to 2 or 3 hertz, sometimes with short âsleepâ spindles of about 15 hertz.
The SI unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz. One hertz means that an event repeats once per second. A previous name for this unit was cycles per second (cps). The SI unit for period is the second.