Based on his analysis of code, McVicker predicts several features in the upcoming game: Advanced physics engine: The game could have a physics engine similar to that of Half-Life 2, with detailed ...

This is called the half-life. Key fact Half-life is the time it takes for the activity of the source to fall to half its original value. The illustration below shows how a radioactive sample is ...

Look at this point on the graph in relation to the y-axis. You will see that the counts per minute have halved in two days. This means that it has a half-life of two days.