For now, for GCSE exams, let's go along with the idea that the rate of radioactive decay does not depend on external factors.
Free 5-day trial Use this quiz/worksheet combo to help assess your knowledge of how radioactive dating works.
Some of the topics you will need to be aware of include how to measure the age of a rock, what an atomic clock means, and what method of radioactive dating would be used for an Egyptian mummy.
The concept that in certain (r-selected) populations, a high reproductive rate is the chief determinant of life history.
A type of embryonic development in deuterostomes in which the planes of cell division that transform the zygote into a ball of cells are either parallel or perpendicular to the polar axis, thereby aligning tiers of cells one above the other.
After all, textbooks, media, and museums glibly present ages of millions of years as fact.
Yet few people know how radiometric dating works or bother to ask what assumptions drive the conclusions. This figure wasn’t established by radiometric dating of the earth itself. Radiohalos shouldn’t exist, according to conventional wisdom!
That's what we've believed for some time - but recent research makes us wonder if this is true after all.
There is some evidence of slight seasonal variations in the rates of radioactive decay of some isotopes, which may be due to temperature differences. Or may be due to something else we don't know about yet.
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