The rate at which nuclei decay is constant. Half-life describes the interval of time during which half of the original atoms decay. Give each group a shoe box and one set (80) of either pennies ...

Radioactive decay is a spontaneous ... statistical methods to tell when half the unstable nuclei in a sample will have decayed. This is called the half-life. Key fact Half-life is the time it ...

This rate of decay is constant for a given isotope, and the time it takes for one-half of a particular isotope to decay is its radioactive half-life. For example, about 1.5 percent of a quantity ...

A spontaneous process means that it is not possible to say which particular nucleus will decay ... when half the unstable nuclei in a sample will have decayed. This is called the half-life.