Use an analogy from everyday life that can define the term half-life

depreciation

Sure! Let's use the analogy of a cup of hot coffee.

Imagine you have a freshly brewed cup of hot coffee sitting on the table. The temperature of the coffee will gradually decrease over time. The time it takes for the coffee to cool down to half of its original temperature is similar to the concept of half-life.

In this analogy, the half-life of the coffee is the time it takes for the temperature to drop by half. Let's say the initial temperature of the coffee was 100 degrees Celsius. After one-half-life, the temperature would decrease to 50 degrees Celsius. After another half-life, it would go down to 25 degrees Celsius, and so on.

Similar to how radioactive elements have a half-life, which is the time it takes for half of the atoms in a sample to decay, the coffee's half-life represents the time it takes for half of its initial heat energy to dissipate.

So, just like the coffee gradually cools down over time, the concept of half-life refers to a gradual decrease or decay of a certain quantity or substance.