RADIO-FREQUENCY

Radio frequency, or RF, is a frequency or rate of oscillation within the range of about 3 Hz and 300 GHz. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves. Since most of this range is beyond the vibration rate that most mechanical systems can respond to, RF usually refers to oscillations in electrical circuits.
See more at Wikipedia.org...

radio-frequency /'reidiou'fri:kwənsi/
danh từ tần số rađiô
(C) 2007 www.TừĐiểnTiếngViệt.net