Exponential Growth & Decay (Edexcel A-Level Mathematics): Quizzes

Variable in the index power

Initial value at $t = 0$

$k > 0$

Increases as the quantity grows

$y = y_0 e^{-kt}$

Radioactive decay & depreciation

$\frac{\ln(2)}{k}$

$\frac{\ln(2)}{k}$

$y$ is multiplied by 2

Take natural logarithm