: The substance doesn't disappear linearly. After one half-life, 50% remains; after two, 25% remains; after three, 12.5% remains, and so on.
Half-life ( t1/2t sub 1 / 2 end-sub ) is the time required for a quantity to reduce to of its initial value. While most commonly associated with radioactive decay , the concept also applies to pharmacology (how long a drug stays in your system) and even the "decay" of information or marketing effectiveness. 1. Key Principles half lfe
If you are asked how much remains after a specific number of half-lives ( : The substance doesn't disappear linearly
To solve half-life problems, you typically use one of two methods depending on whether you are dealing with whole half-life intervals or specific timeframes. While most commonly associated with radioactive decay ,
: For a specific substance, the half-life never changes, regardless of how much you start with or external factors like temperature or pressure.