The number of waveperiods per time interval. The linear frequency, ν, is the number of cycles per time interval. SI unit Hz = s-1.
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the symbol ω (= 2πν) is used with rad s-1 as the SI unit.
See also: frequency
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 345 (https://doi.org/10.1351/pac200779030293)