Question

Define activity of a radioactive material and write its si uits

Answer 1

Activity,in radioactive-decay processes,the number of disintegrations per second,or the number of unstable atomic nuclei in a given sample.
it's SI unit is 'becquerel'(symbol:bq)

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.