Nuclear Physics Question:

In radioactive dating we use half life to determine the age of a sample but not average life why?

It is a quantitative measure in which we compare the
quantity of a radioactive substance in the sample to that
in the atmosphere/fresh substance.

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What is meant by the rest mass energy of an electron?	Name the Women scientist who has played the pivotal role in the development Missile technology of India and nick named as "Missile Woman"?