frequency of the signal frequency of the sound frequency of urination frequency of use frequency of vibration frequency of visits frequency offset frequency oscillator frequency output frequency plan frequency planning frequency power frequency pulse frequency questionnaire frequency questionnaires frequency radiation frequency radio frequency range frequency ranges frequency ratio frequency reference frequency region frequency regulation frequency resolution frequency resource frequency resources frequency response frequency response curve frequency responses frequency restoration frequency reuse frequency scale frequency scaling frequency scan frequency search frequency selected frequency selection frequency selective frequency set frequency setting frequency shall frequency shift frequency shift keying frequency shifts frequency should frequency signal frequency signals frequency sounds frequency source frequency spectra frequency spectrum frequency stability frequency standard frequency standards frequency step frequency sweep frequency synchronization frequency synthesis frequency synthesizer frequency synthesizers frequency system frequency table frequency tables frequency technology frequency test frequency that you frequency transform frequency transformation frequency transformer frequency transmitter frequency transposition frequency tuning frequency unit frequency unknown frequency use frequency used frequency using frequency value frequency values frequency variation frequency variations frequency varies frequency vibration frequency vibrations frequency voltage frequency waves frequency when frequency words frequency would frequency-dependent frequency-division frequency-domain frequency-modulated frequent frequent absences frequent activity frequent and intense frequent and regular frequent and severe