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.
Conversely, all higher center frequencies for 1/2-octave bands can be defined from each other using the formula 121 2 ctr ctr fnn + = f. Then for each center frequency, the 1/4-octave low (high) frequency for each 1/2-octave band are (respectively) given by the formulae low 2 14 ffnn = and high 2 14 fnn = f.f we set/define the 13 th half-octave bandâs center frequency to be 13 1000 f ctr â¡ Hz, then all lower center frequencies for 1/2-octave bands can be defined from each other using the formula 121 2 ctr ctr ffnn â = .