The Age of the Earth
Sep 10, The Earth is accepted by scientists to be around billion years old. The most direct means for calculating the Earth's age is a Pb/Pb isochron age, between several meteorites and by several different dating methods. Trigonometry is a branch of mathematics that studies relationships involving lengths and (The value we call sin(θ) can be found by looking up the chord length for .. The law of sines (also known as the "sine rule") for an arbitrary triangle states: . A sentence more appropriate for high schools is "'Some Old Horse Came. Nov 17, The idea of using a formula to calculate appropriate ages is not new. The “half your age plus seven” rule has appeared in popular culture for.
But in China, we study together. Like other women in my social circle, I have certain demands for a potential mate. He doesn't have to make much more than I do, but he must be doing at least as well as I am, and has to be compatible with me, both morally and spiritually He should also own an apartment instead of us buying one together. Remember what Virginia Wolf [sic] said? Every woman should have a room of her own. One account suggests that the dating scene in Beijing is "sad" with particular difficulties for expatriate women hoping to find romance.
In Arabic numerals, the day looks like "", that is, "like four single people standing together", and there was speculation that it originated in the late s when college students celebrated being single with "a little self-mockery"  but a differing explanation dates it back to events in the Roman Empire. Jinguoyuan organized periodic matchmaking events often attended by parents. Some men postpone marriage until their financial position is more secure and use wealth to help attract women.
One trend is towards exclusive matchmaking events for the 'rich and powerful'; for example, an annual June event in Wuhan with expensive entry-ticket prices for men 99, RMB lets financially secure men choose so-called bikini brides based on their beauty and education and the financial exclusivity of the event was criticized by the official news outlet China Daily.
There was a report that sexual relations among middle schoolers in Guangzhou sometimes resulted in abortions. In the cities at least, it is becoming more accepted for two people to meet and try to find if there is compatibility. Writer Lavina Melwani described a happy marriage which had been arranged by the bride's father, and noted that during the engagement, the woman was allowed to go out with him before they were married on only one occasion; the couple married and found happiness.
Until recently, Indian marriages had all the trappings of a business transaction involving two deal-making families, a hardboiled matchmaker and a vocal board of shareholders — concerned uncles and aunts. The couple was almost incidental to the deal. They just dressed and showed up for the wedding ceremony.
And after that the onus was on them to adjust to the 1, relatives, get to know each other and make the marriage work. When this leads to a wedding, the resulting unions are sometimes called love marriages. Yet, when five radiometric dating methods agree on the age of one of the Earth's oldest rock formations Dalrymplep.
The claim that the methods produce bad results essentially at random does not explain why these "bad results" are so consistently in line with mainstream science.
The Age of the Earth
Claims that the assumptions of a method may be violated Certain requirements are involved with all radiometric dating methods. These generally include constancy of decay rate and lack of contamination gain or loss of parent or daughter isotope. Creationists often attack these requirements as "unjustified assumptions," though they are really neither "unjustified" nor "assumptions" in most cases.
Rates of radiometric decay the ones relevant to radiometric dating are thought to be based on rather fundamental properties of matter, such as the probability per unit time that a certain particle can "tunnel" out of the nucleus of the atom.
The nucleus is well-insulated and therefore is relatively immune to larger-scale effects such as pressure or temperature. Significant changes to rates of radiometric decay of isotopes relevant to geological dating have never been observed under any conditions. Emery is a comprehensive survey of experimental results and theoretical limits on variation of decay rates.
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For the case of alpha decay, [ You will find a simple explanation in any elementary quantum mechanics textbook; for example, Ohanion's Principles of Quantum Mechanics has a nice example of alpha decay on page The fact that the process is probabilistic, and the exponential dependence on time, are straightforward consequences of quantum mechanics. The time dependence is a case of "Fermi's golden rule" see, for example, page of Ohanion. An exact computation of decay rates is, of course, much more complicated, since it requires a detailed understanding of the shape of the potential barrier.
In principle, this is computable from quantum chromodynamics, but in practice the computation is much too complex to be done in the near future. There are, however, reliable approximations available, and in addition the shape of the potential can be measured experimentally.
For beta decay, the underlying fundamental theory is different; one begins with electroweak theory for which Glashow, Weinberg and Salam won their Nobel prize rather than quantum chromodynamics.
As described above, the process of radioactive decay is predicated on rather fundamental properties of matter. In order to explain old isotopic ages on a young Earth by means of accelerated decay, an increase of six to ten orders of magnitude in rates of decay would be needed depending on whether the acceleration was spread out over the entire pre-Flood period, or accomplished entirely during the Flood.
So there has been a lot of creative work on how to look for evidence of such changes.
Dating - Wikipedia
A nice technical summary is given by Sisterna and Vucetich Among the phenomena they look at are: While it is not obvious, each of these observations is sensitive to changes in the physical constants that control radioactive decay. For example, a change in the strength of weak interactions which govern beta decay would have different effects on the binding energy, and therefore the gravitational attraction, of different elements.
Similarly, such changes in binding energy would affect orbital motion, while more directly changes in interaction strengths would affect the spectra we observe in distant stars.