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Posted by / 23-Jan-2018 07:58

The half-life , specific to each nuclide, can be accurately measured on a pure sample, and is known to be independent of the chemical composition of the sample, temperature and pressure.Through analysis, a bone fragment is determined to contain 13% of its original carbon-14.Without the starting time it is Actually, knowing the starting time is still not enough.During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.When I have asked an audience this question they have looked at me incredulously and said, “Starting time?” You cannot know how long the swimmer took unless you knew the time on the wristwatch when the race started.Various elements are used for dating different time periods; ones with relatively short half-lives like carbon-14 (or C) are useful for dating once-living objects (since they include atmospheric carbon from when they were alive) from about ten to fifty thousand years old. Longer-lived isotopes provide dating information for much older times.

You could describe the atomic workings of the quartz oscillator and how it resonates at a specific and highly stable frequency, and how this is used to accurately pace a timekeeping mechanism.But they omit discussion of the basic flaw in the method: you cannot measure the age of a rock using radioactive dating because you were not present to measure the radioactive elements when the rock formed and you did not monitor the way those elements changed over its entire geological history.If you check this educational page by the US Geological Society you will see that they spend all their time talking about the technicalities of radioactive decay.Each page linked to below includes detailed references.Although the time at which any individual atom will decay cannot be forecast, the time in which any given percentage of a sample will decay can be calculated to varying degrees of accuracy.

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This section lists numerous questions in the area of evolution, creationism and intelligent design and related topics, and then presents answers based on best available scholarship.