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How do scientists know how old an object or human remains are?What methods do they use and how do these methods work?At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,000 years old.A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago.The real life friendship of Ariana and Liz is often called "Eliana" (Eli/zabeth and Ari/ana) by fans.­ ­You probably have seen or read news stories about fascinating ancient artifacts.While the moment in time at which a particular nucleus decays is random, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life, usually given in units of years when discussing dating techniques.After one half-life has elapsed, one half of the atoms of the substance in question will have decayed.

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This transformation is accomplished by the emission of particles such as electrons (known as beta decay) or alpha particles.

Therefore, in any material containing a radioactive nuclide, the proportion of the original nuclide to its decay product(s) changes in a predictable way as the original nuclide decays.