They are words that occur frequently, examples, 'as, the, and, it'. These words contribute a great deal of meaning to any sentence.
Frequecy
DC has no frequency.
Gamma rays
Becoz it use frequecy to start
frequecy will not change
Answer Radio waves in the kilo-hertz frequecy ranges.
The frequecy is o,74958 Hz.
Frequency of a wave is how many times a wave passes through by the setting of number of seconds.
The photon energy of 1022 Hz is 4.22664452E-12 electron volts.
fs may refer to sampling frequency which is the frequecy used to sample an analog signal.
It varies - according to which system is in use. The related link to Wikipedia lists the uplink & downlink frequencies.
frequecy and period have an indirect relationship F=1/4s =.25 Hertz