The amount of time it takes to disintegrate by half an initial amount.
The time it took to turn half a reactant into the product(s). The time required to undergo radioactive decay in half of a given sample. Half-life definition: The time it takes for half the atoms of an unstable element or nuclide to decay radioactively into another element or nuclide
For a given reaction, a reactant's half-life t1/2 is the time it takes for its concentration to reach a value which is the arithmetic mean of its initial and final (equilibrium) value. For a fully consumed reactant, it is the time it takes for the concentration of the reactant to fall to half its initial value. For a first-order reaction the reactant's half - life may be called the reaction 's half-life. In nuclear chemistry, (radioactive) half - life is defined as the time required for the operation to decrease by that process to half its value, for a simple process of radioactive decay.
Half-Life is usually defined as the time it takes for a radioactive substance (or one-half of the atoms) to disintegrate or turn into another. The theory was first explored by Ernest Rutherford in 1907. Typically the symbol Ug or t1/2 reflects this.
If we take a radioactive element which has a half - life of one hour to help you understand the concept better.
Ok, if the radioactive element is taken in a case where half of the atoms have decayed after half a lifetime, it would be appropriate to assume that they have a well-defined average viz life expectancy. Atoms with a mean life that is considerably longer than their half - life. This would mean the mean life would be the half-life divided by 2 which is the standard algorithm. The half - life, on the other hand, is often represented in probability terms.
Below you'll find the half - life formulas used to explain the deterioration of substances.
N(t) = No (½) t / t ½
N(t) = No e-t / r
N(t) = No e– λt
consider the following,
N0 = the initial quantity of the substance
N(t) = the quantity that is left over
t1⁄2 = half-life
τ = mean lifetime of the decaying quantity
λ = decay constant