Frequency

The rate of repetition of periodic motion measured in hertz (cycles per second). Rate of repetition of changes.

where

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.

See also: Angular Frequency, Audio Frequency, Bandwidth, Doppler Effect, Extremely Low Frequency, Frequency Spectrum, Fundamental, Group Delay, Harmonic, Hertz, Octave, Per Diem, Per Mensem, Period, Phase, Very High Frequency, Wavelength.

Weblinks:

NASA Electromagnetic Spectrum Page A NASA page on the electromagnetic spectrum.