The rate of repetition of periodic motion measured in hertz (cycles per second). Rate of repetition of changes.
f = frequency [Hz]
T = period [s]
v = wave speed [ms-1]
λ = wavelength [m]
ω = angular frequency [rad s-1]
Enter values into 2 of the 5 fields. The others will be calculated.
For low frequency events (e.g. long pendulum) the frequency can be measured by counting the number of complete cycles and dividing by the total time for those cycles.
|lower audible limit||20 Hz|
|middle C||264 Hz|
|treble A||440 Hz|
|upper audible limit||20000 Hz|
|VHF radio||30 to 300 MHz|
|UHF radio||300 to 3000 MHz|
|Red end of visible spectrum||4.284x1014Hz|
|Violet end of visible spectrum||7.495x1014Hz|
See also: Angular Frequency, Audio Frequency, Bandwidth, Doppler Effect, Extremely High Frequency, Extremely Low Frequency, Frequency Spectrum, Fundamental, Group Delay, Harmonic, Hertz, High Frequency, Low Frequency, Medium Frequency, Octave, Per Diem, Per Mensem, Period, Phase, Ultra Low Frequency, Very High Frequency, Wavelength.
- NASA Electromagnetic Spectrum Page A NASA page on the electromagnetic spectrum.