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.
The range of frequencies used for a particular radio transmission (e.g. 36 MHz). It is the difference between the lowest and highest transmission frequencies used by a signal... The range of frequencies used for a particular radio transmission (e.g. 36 MHz). It is the difference between the lowest and highest transmission frequencies used by a signal... Typically used to refer to a range of frequencies intended for direct reception of satellite television and entertainment services.