Question

The half-life period and the mean life period of a radioactive element are donated respectively by Th and Tm then​

Answer 1

Explanation:

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Solved Examples on Half-time and Average-Life

The half-life of a radioactive substance represents the time required for a radioactive isotope to decrease by a factor of two. It may be written as

Nt = N0/2.

The half- life does not specify the duration of time period for which a radioactive substance will remain radioactive but it just tells the time for its radioactivity to halve. Some elements have a relatively short half-life. These are the elements which are used for medical purposes as they do not remain radioactive for long and hence result in a low radiation dose.