频率
频率（英语：Frequency）是单位辰光内某事件重复发生个次数，勒物理学中通常以符号f 或ν 表示。采用国际单位制，渠个单位为赫兹（英语：Hertz，简写为Hz）。设τ 辰光内某事件重复发生n 次，则箇事件发生个频率为f = n / τ 赫兹。又因为周期定义为重复事件发生个最小辰光间隔，故频率也可以表示为周期个倒数。
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