Restructure according to guidelines in Wikipedia:WikiProject Science, ie. with the following sections:
- Introduction : add daily life examples (music, vibration, radio, light)
- Frequency in practice
- Types of frequencies: in statistics, frequency modulation, of waves
- Units of frequency: Hz, per day,...
- Frequency in everyday life : give examples with typical values: heartbeat, light, radio, sound, computer clock ...
- Frequency in industry: how to generate various frequencies
- Frequency in science: how to measure it, interferometry
- Frequency in theory: period, wavelength, relation to energy in quantum theory, Fourier Transform, frequency of interferences, ...
- History of frequency : cps → Hertz, relation to quanta, ...
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