Half Lfe -

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

: 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 lfe

N=N0(12)ncap N equals cap N sub 0 open paren one-half close paren to the n-th power Half Life Radiation: 9 Essential Facts About Decay Formulas Half-life ( t1/2t sub 1 / 2 end-sub