What is a half-life?
A)It is the time it takes for 1/2 of the material to undergo radioactive decay.
B)It is the time needed until 1/2 of the radiation is gone.
C)It is the time it takes for 1/2 of the material to decompose.
D)It is half of the lifetime of the radioactivity in a sample.
E)all of the above

Question

Quizplus · Accepted Answer

A half-life is defined as the time it takes for half of the atoms in a radioactive substance to decay. This means that after one half-life, half of the original substance remains, and after two half-lives, one fourth of the original substance remains, and so on.

What Is a Half-Life