**Description**: 3 parts:

- find and write the differential equation;

- exercise: carbon-14 dating;

- how to solve the differential equation.

**Definitions**

__Radioactive decay__: process by which an unstable atomic nucleus loses matter or energy by radiation.

A radioactive material containing unstable nuclei.

Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay).

__Differential equation__: In mathematics, a differential equation is an equation that relates one or more functions and their derivatives.

__Half-life__: The time required for half the atoms of a particular radioisotope to decay into another isotope.