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Frequency & period

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Frequency & period diagram
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Frequency and period are reciprocals of each other. CalcTool is able to handle reciprocal units within a single menu, so this calc may be used for frequency-to-frequency, period-to-period, or interconversion between the two.
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Frequency and period are used to measure properties of waves (e.g. sound, light, ocean waves) as well as other predictable events. Events that happen aperiodically but with a predictable average rate (such as radioactive decay) are often measured in Bequerels (Bq).