Stats: 3,184,199 members, 7,923,031 topics. Date: Friday, 16 August 2024 at 04:59 PM |
Nairaland Forum / Mkmyers45's Profile / Mkmyers45's Posts
(1) (2) (3) (4) (5) (6) (7) (8) ... (21) (22) (23) (24) (25) (26) (27) (28) (29) (of 211 pages)
![]() |
2 Corinthians 6:14 Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? 1 Like |
![]() |
Emusan: Tree-ring dating gives us a wonderful check on the radiocarbon dating method for the last 8000 years. That is, we can use carbon-14 dating on a given tree-ring (the 8000-year sequence having been assembled from the overlapping tree-ring patterns of living and dead trees) and compare the resulting age with the tree-ring date. A study of the deviations from the accurate tree-ring dating sequence shows that the earth's magnetic field has an important effect on carbon-14 production. When the dipole moment is strong, carbon-14 production is suppressed below normal; when it is weak, carbon-14 production is boosted above normal. What the magnetic field does is to partially shield the earth from cosmic rays which produce carbon-14 high in the atmosphere. Dr Libby's experiment is based on the fact that the rate of removal and deposition is the same but the evidence for the earth’s having a progressively stronger magnetic field in the past is based on reliable historical measurements and “fossil” magnetism trapped in ancient pottery. So how do you make you calculations when the best estimates indicate that the earth’s magnetic field was twice as strong 1,400 years ago, and possibly four times as strong 2,800 years ago? |
![]() |
davidylan: Please...Please...Please show me a proper peer-reviewed article that rubbishes this experiment.....We all know that the results of the experiment were later improved and more accurate findings reached but please show me where it was rubbished |
![]() |
Emusan: @Evil Brain Radiocarbon dating (or simply carbon dating) is a radiometric dating technique that uses the decay of carbon-14 (14 C) to estimate the age of organic materials, such as wood and leather, up to about 58,000 to 62,000 years.[1] Carbon dating was presented to the world by Willard Libby in 1949, for which he was awarded the Nobel Prize in Chemistry. Since its introduction it has been used to date many items, including samples of the Dead Sea Scrolls, the Shroud of Turin, enough Egyptian artifacts to supply a chronology of Dynastic Egypt,[2] and Ötzi the Iceman.[3] The dating technique is based on the fact that carbon is found in various forms, including the main stable isotope (12 C) and an unstable isotope (14 C) in all organic matter. Through photosynthesis, plants absorb both forms from carbon dioxide in the atmosphere. When an organism dies, it contains a ratio of 14C to 12C, but, as the 14 C decays with no possibility of replenishment, the ratio decreases at a regular rate. This rate is known as the half-life of 14C. The measurement of 14C decay provides an indication of the age of any carbon-based material (a raw radiocarbon age).[4] However, over time there are small fluctuations in the ratio of 14C to 12C in the atmosphere, fluctuations that have been noted in natural records of the past, such as sequences of tree rings and cave deposits. These records allow for the fine-tuning, or calibration, of the indications derived from measuring the carbon ratio. A raw radiocarbon age, once calibrated, yields a calendar date. One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites. Samples older than the upper age-limit cannot be dated because the small number of remaining intrinsic 14C atoms will be obscured by the 14C background atoms introduced into the samples while they still resided in the environment, during sample preparation, or in the detection instrument. As of 2007, the limiting age for a 1 milligram sample of graphite is about ten half-lives, approximately 60,000 years.[41] This age is derived from that of the calibration blanks used in an analysis, whose 14C content is assumed to be the result of contamination during processing (as a result of this, some facilities[41] will not report an age greater than 60,000 years for any sample). A variety of sample processing and instrument-based constraints have been postulated to explain the upper age-limit. To examine instrument-based background activities in the AMS instrument of the W. M. Keck Carbon Cycle Accelerator Mass Spectrometry Laboratory of the University of California, a set of natural diamonds were dated. Natural diamond samples from different sources within rock formations with standard geological ages in excess of 100 Ma yielded14C apparent ages 64,920 ± 430 BP to 80,000 ± 1100 BP as reported in 2007. https://en.wikipedia.org/wiki/Radiocarbon_dating Where does the 5,000 year limit come from when the same method you describe is been used to date material 60,000 years old which is much more 'older' than the 30,000 years you talk about as equilibrium. |
![]() |
Alfa Seltzer: Now you understand why no sane atheist, theist or deist will be busting his head over a question that only be answered with questions? Obviously its open for debate but i bet my two cents that NO atheist can successfully counter all points raised by Deepsight....Including the BB and Evolution crusaders 1 Like |
![]() |
I am asking just so to be clear and for clear scholastic purposes only.....Is there an explanation of life? |
![]() |
mazaje: Why can't atheist just agree that the big bang and evolution are plausible explanations for what we see around. . .The dogmatic approach that some atheist hold about these explanations is mind boggling. . .Big bang, evolution seem very plausible and actually explain a lot with some evidence to back them up. . . .But we do not know them to be facts, do we?. . . Oh Please.....I don't expect to hear you say this. Its downright questioning of your atheism. |
![]() |
Geheimdienste sind ein Symptom... nicht die Krankheit. 1 Like |
![]() |
Luis Enrique has no pedigree and he will just set Barcelona up for failure 1 Like |
![]() |
mkmyers45: |
![]() |
Sehr schöne Arbeit Bruder zu tun weiter so |
![]() |
chamotex: Kindly send me the H2H and FA CUP CODES I finished 19th in H2H |
![]() |
Mr_Nice_Guy: thank you ASUU for giving me this golden opportunity to to think out the bookish box and learn forex,. keep it Up ASUU.. Easy Tiger.... Its all about priorities brother |
![]() |
Its Yerima not Yarima |
![]() |
Any updates? |
![]() |
Kirinwa: Im on the move |
![]() |
Oya Gold...Lets Go |
![]() |
Manweysabi: Mai Gida I have been busy wallahi How market? |
![]() |
sunwalk: Pardon me sir I was asking for his indicators because i want to back test it.....I am tester and i also write codes for MT4 system...Anyway it seems you are a new comer to BOM on nairaland..... You surely never experienced the era of night-vigils |
![]() |
Ravenwolf: Please dont laugh at me oh... but i need to know how to setup MT4 and the indicators i have downloaded... Where did you download the indicators? Someone help me with the link... |
![]() |
Welldone guys |
![]() |
Finished under the top 20 last year but i'm just returning from the mountain so we got it covered this time ![]() ![]() ![]() ![]() Squad Zero Reporting for Pre-season |
![]() |
Allah you guys are not serious ![]() ![]() ![]() 1 Like |
![]() |
Its a hoax...Thread Locked |
![]() |
Use google advert options 1 Like |
![]() |
Will they be re-meet? i can't make the 4th but from 20th will do |
![]() |
jeebz: Tevez, Llorente, Scratch that....we need another person there who is more physical... |
![]() |
bharkarh: dis Bros can lie o....haba 30hrs......football manager dat is damn boring...maka y? Boring to you but the most addictive game in the game...caio |
![]() |
obadiah777: WELL DAYUMMM FAKE DRUGS ? obeezy my hommy...how now? |
![]() |
Cashcard1: ASUU universities meeting is on 29th of this month... this is true.... |
(1) (2) (3) (4) (5) (6) (7) (8) ... (21) (22) (23) (24) (25) (26) (27) (28) (29) (of 211 pages)
(Go Up)
Sections: politics (1) business autos (1) jobs (1) career education (1) romance computers phones travel sports fashion health religion celebs tv-movies music-radio literature webmasters programming techmarket Links: (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Nairaland - Copyright © 2005 - 2024 Oluwaseun Osewa. All rights reserved. See How To Advertise. 55 |