We don't see any of that. This means that the tree-ring dates would be slightly too young, not too old. GR is based entirely around the immutable assertion of c being constant in all frames of reference. We detect light from a distant galaxy cluster carrying the absorption line at This can be very useful when we look at things that have happened in the last few thousand years, where you have a better idea of events and knowing whether one thing happened before or after another with good precision can be very useful. Before plate tectonics and continental drift became established in the mid-sixties, the known evidence for magnetic reversals was rather scanty, and geophysicists often tried to invent ingenious mechanisms with which to account for this evidence rather than believe in magnetic reversals. Creationists are forced into accepting such outlandish conclusions as these in order to jam the facts of nature into the time frame upon which their "scientific" creation model is based. The energy in the velocity as light has momentum has to come from somewhere or go to somewhere. Optically stimulated luminescence dating. The principles are the same as what I described above for radiocarbon, but with other elements that have much longer half-lives.
Bucha, who has been able to determine, using samples of baked clay from archeological sites, what the intensity of the earth's magnetic field was at the time in question. Therefore, every time the magnetic field reverses itself, bands of paleomagnetism of reversed polarity show up on the ocean floor alternated with bands of normal polarity. This half-life is very constant and will continue at the same rate forever. If it does not entirely contradict them, we put it in a footnote. However, by , sea floor spreading and magnetic reversals had been documented to the satisfaction of almost the entire scientific community. Since the tree ring counts have reliably dated some specimens of wood all the way back to BC, one can check out the C dates against the tree-ring-count dates. They attempted to account for this by setting as a standard year for the ratio of C to C, and measuring subsequent findings against that. Barnes has claimed that the earth's magnetic field is decaying exponentially with a half-life of fourteen hundred years. This means that you can in some cases date things up to 2 billion years old. Not only does he consider this proof that the earth can be no older than ten thousand years but he also points out that a greater magnetic strength in the past would reduce C dates. There is a good correlation between the strength of the earth's magnetic field as determined by Bucha and the deviation of the atmospheric radiocarbon concentration from its normal value as indicated by the tree-ring radiocarbon work. Even before the bristlecone pine calibration of C dating was worked out by Ferguson, Bucha predicted that this change in the magnetic field would make radiocarbon dates too young. Before his work, the tree-ring sequence of the sequoias had been worked out back to BC. Radiocarbon dating cannot be used for older specimens, because so little carbon remains in samples that it cannot be reliably measured. It does mean that going back tens of thousands of years, you might have an error of several hundred or even a few thousand years, which sounds like a lot but it means that you can say that something happened thousand years ago. Thus these calibrations are very reliable indeed. Specifically, there are two types of carbon found in organic materials: And then as 3clipse said, there are plenty of other radiometric dating techniques. However, in either case, the background beta radiation has to be compensated for, and, in the older objects, the amount of C they have left is less than the margin of error in measuring background radiation. The radiocarbon dates and tree-ring dates of these other trees agree with those Ferguson got from the bristlecone pine. You would need to give mass some kind of property that changes c. Most of the tree-ring sequence is based on the bristlecone pine. This affects the ratio of 14 C to 12 C in the different reservoirs, and hence the radiocarbon ages of samples that originated in each reservoir. How does carbon dating work? If we extrapolate backwards in time with the proper equations, we find that the earlier the historical period, the less C the atmosphere had. In discussions of the age of the earth and the antiquity of the human race, creationists often assail perceived weaknesses in radiocarbon dating. These and numerous other claimed anomalies in radiocarbon dating are explained in detail in Mark Isaak's book [ Isaak , pg.
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