Question

which of the following describes the concept of half - life? the time it takes for a substance to change color the time it takes for half of a radioactive substance to decay the time it takes for a substance to double in quantity the time it takes for a substance to completely decay

Explanation:

Half - life is a well - known concept in natural science, specifically in the study of radioactive substances. It is defined as the time it takes for half of a radioactive substance to decay.

Answer:

The time it takes for half of a radioactive substance to decay