What is meaning of the term half life?

Answer 1

That is the time it takes for one-half of certain types of atoms to disintegrate. For example, if you have a kilogram of C-14 atoms, after about 5000 years you will only have half a kilogram left - hence, its half-life is about 5000 years.

Answer 2

Half life is the time taken for half of the radio active element get disintegrated.

Say for example, there are 512 million atoms fresh ie to get disintegrated. Say after a time T half, there will be only 256 million atoms remaining as 256 million atoms have gone into disintegration. Now in another duration of T half, a half of the remaining ie 128 million would have gone into disintegration and 128 million would be there fresh. Now in the next T half duration, 64 million would get disintegrated and 64 million would remain fresh ie to get disintegrated. Thus the total time taken for the entire atoms to get disintegrated will be theoretically infinite.

Answer 3

A half-life of a given radioactive sample of a is defined as the time required for one-half or 50% of the radioactive atoms in that sample to undergo a radioactive decay.

This is also known as the "radioactive" or "physical" half-life. Every radioactive element has a specific half-life associated with it.

Answer 4

The term half-life refers to the period in which the radioactivity or number of atoms of a radioactive substance decreases by half. The term can be applied to any substance whose quantity decreases exponentially with time.

Answer 5

It has something to do with science. Or its an awsome video game. :)

Answer 6

The time taken for the activity off a source to half too its origanal value

Answer 7

the time it takes for half of the current amount to change. many proccesses tend to have a constant or close to constant half life