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.
It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz are commonly expressed in SI multiples kilohertz (103 Hz, symbol kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Kilo equals one thousand, mega equals one million, giga equals one billion and tera equals one trillion.