7/1/2023 0 Comments Half life chemistry![]() Half-lives as short as 10 –6 second and as long as 10 9 years are common. Half-life is the amount of time needed for one half of a given quantity of a substance to decay. One important measure of the rate at which a radioactive substance decays is called half-life, or t 1/2. ![]() This equation shows that radioactive decay is a first-order kinetic process. The SI unit of activity is the bequerel (Bq), defined as one decay per second. R 0 is the activity (rate of decay) at t = 0. In this equation, λ is the decay constant, commonly measured in s –1 (or another appropriate unit of reciprocal time) similar to the rate law constant, k, in kinetics analyses. The mathematical description of this process is shown below. ![]() ![]() One type of nuclear reaction is called radioactive decay, in which an unstable isotope of an element changes spontaneously and emits radiation. ![]()
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