AP BIOLOGY

Detailed explanation-1: -Half‐life is the amount of time it takes for approximately half of the radioactive atoms in a sample to decay into a more stable form. Every radioactive element has a different half‐ life.

Detailed explanation-2: -Half-Life is normally defined as the time needed by a radioactive substance (or one half the atoms) to disintegrate or transform into a different substance. The principle was first discovered in 1907 by Ernest Rutherford. It is usually represented by the symbol Ug or t1/2.

Detailed explanation-3: -Half-life is the time it takes for a substance to decay half of it’s mass. In a radioactive sample, the half-life is defined as the amount of time it takes for half the atoms of the sample to decay. The half-life of a radioactive sample is generally constant over time.

Detailed explanation-4: -Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay. This also implies that one half life is the time that it takes for the activity of a source to fall to half its original value.