Caffeine Information. Caffeine is naturally found in cocoa beans, coffee beans and tea and is synthetically produced for use in certain medications and in beverages. This substance is a stimulant drug that quickly enters the bloodstream and affects the brain.
Frequency Range Chart. The radio spectrum refers to the section of the electromagnetic spectrum that holds all possible radio frequencies ranging from 3 kHz to 300 GHz.Radio frequency is used for radio communication technology, wireless networks and telecommunication systems.he radio spectrum refers to the section of the electromagnetic spectrum that holds all possible radio frequencies ranging from 3 kHz to 300 GHz. Radio frequency is used for radio communication technology, wireless networks and telecommunication systems.
1 A frequency band in which the ratio of the upper frequency limit to the lower frequency limit is. 2  to one third of an octave. 3  The 1000 Hz one-third octave band, for instance, comprises frequencies ranging from about 891 Hz to 1122 Hz. to one third of an octave. 2  The 1000 Hz one-third octave band, for instance, comprises frequencies ranging from about 891 Hz to 1122 Hz. 3  Also called one-third octave frequency band, or third octave band.