Question

define the activity of a given radioactive substance and its SI unit

Answer 1

It is defined as the number of radioactive disinitegrations taking place per second in the sample

Its equation is R =Roe^-lambda t

Units = becquerrel=1 disintegration per sec

Curie = 1ci=3.7×10^10 Bq

Rutherford=1ci=3.7×10^4 rd

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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.