週期

此條目介紹的是物理學的週期。关于數學的週期，请见「週期函數」。
此條目介紹的是物理學的週期。关于元素週期表的週期，请见「元素週期」。

週期（英語：period）指的是完成往復運動一次所需要的時間，物理學上通常以 表示，單位為s。

週期為頻率（物理學上通常以 表示）的倒數：

  • 在物理的波動學上，波的週期即是波行經介質時，介質的上一個質點完成一次振動的時間。
  • 在物理上，當一彈簧作簡諧運動時，其振盪的週期 T 為：

其中 為彈簧的質量， 為彈簧的劲度系數（或称倔强系数）， 為擺盪的週期。 而其質量的單位為kg，劲度系数的單位為N/m，週期的單位為s。

定義

  • 振源做一次完整振動所需時間
  • 產生一個全波所需時間
  • 波前進一個波長距離所需時間
  • 介質做一次完整振動所需時間
  • 一個全波通過某點介質所需時間

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