Question

Define activity of a given radioactivity substance.write its S.I unit

Answer 1

activity in radioactive decae prosses the number of disintegrations per second or the number of unstable atomic nuclei that decave per second in the given sample.

Answer 2

Explanation:

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles or photons.