Define Half-Life?

Question

Define Half-Life in a paragraph.

Answer 1

Half-Life is an awesome game :D

Half-Life is the time required for half of the original amount of a substance to undergo a process. For example, the time required for half of the atoms of a radioactive substance to undergo decay; or the time required for half of a ingested substance to be excreted from the body.

Answer 2

Half-life is the lazy man's way of charactering first order decay processes. In such processes, the rate of loss of the initial population is proportional to the population at any time. Imagine 1000 people suddenly in a prison with a ruthless warden. Every day, he has 10 percent of the population shot. So on the first day, 100 are shot, leaving 900. On the second day, 81 will be shot, leaving 819, and so on. The continuous process has the relation
dP/dt = -kt, P=Po when t=0.
without going into the solution, the half-life (or the time it takes for the population to reduce to half its initial amount) = 0.693/k. The half-life has the property that if you redefine Po and t, the half-life to attain Po/2 is the same. k has the property that when kt=1, the population is reduced to 39 percent of its initial level, and for each time interval for which kt=1, this relation is also true.

Answer 3

1. The amount of time it takes for half of the radioactive atoms in a radioactive isotope to decay.

2. A stonking good game.

Answer 4

The organic and organic a million/2-existence or removal a million/2 existence of a substance is the time it takes for a substance (drug, radioactive nuclide, or different) to lose a million/2 of its pharmacologic, physiologic, or radiologic interest, as in keeping with the MeSH definition. In a clinical context, a million/2-existence might additionally describe the time it takes for the blood plasma concentration of a substance to halve ("plasma a million/2-existence"). the courting between the organic and organic and plasma a million/2-lives of a substance could be complicated, with the aid of components such as accumulation in tissues, energetic metabolites, and receptor interactions.

Answer 5

A half-life is a value for measuring chemical decay.