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A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where ''N'' is the quantity and λ (lambda) is a positive rate called the exponential decay constant: : The solution to this equation (see derivation below) is: : Here ''N''(''t'') is the quantity at time ''t'', and ''N''0 = ''N''(0) is the initial quantity, i.e. the quantity at time ''t'' = 0. == Measuring rates of decay== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Exponential decay」の詳細全文を読む スポンサード リンク
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