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10-May-2020 09:26
Far from being data, these dates are actually interpretations of the data.
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You can use the hourglass to tell time if you know several things: the amount of sand in the top of the hourglass when it started flowing, the rate that the sand flows through the hole in the middle, and that the quantity of sand in each chamber has not been tampered with.The starting isotope is called the parent and the end-product is called the daughter.The time it takes for one half of the parent atoms to decay to the daughter atoms is called the half-life.If certain things are known, it is possible to calculate the amount of time since the parent isotope began to decay.
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For example, if you began with 1 gram of carbon-14, after 5,730 years you would be left with 0.50 g and only 0.25 g after 11,460 years.There is also a difference in the timescale used to explain the layers.
