Video: Ob yam khoom twg geologists siv hauv xov tooj cua sib tham?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Geologists feem ntau siv xov tooj cua sib tham txoj kev, raws li lub ntuj radioactive decay ntawm tej yam xws li poov tshuaj thiab carbon, raws li txhim khu kev qha moos rau hnub cov xwm txheej thaum ub.
Tsis tas li ntawd, ob yam tshuaj twg uas cov kws tshawb fawb siv hauv radiocarbon sib tham?
Nws tseem hu ua carbon sib tham los yog carbon-14 sib tham . Qhov no yog qhov tseem ceeb siv nyob rau hauv archaeology los txiav txim lub hnub nyoog ntawm fossil fuels. Lawm, carbon muaj nyob rau hauv ob ruaj khov nonradioactive cov ntaub ntawv thiab cov no yog carbon-12 thiab carbon-13. Nws muaj ib qho tsis ruaj tsis khov hluav taws xob isotope ntawm carbon-14.
Tsis tas li ntawd, 3 txoj hauv kev ntawm kev sib tham pob zeb yog dab tsi? Ua ke nrog cov hauv paus ntsiab lus stratigraphic, radiometric sib tham Cov txheej txheem yog siv nyob rau hauv geochronology los tsim kom tau lub sij hawm geology. Ntawm cov txheej txheem paub zoo tshaj plaws yog radiocarbon dating, poov tshuaj - argon sib tam thiab uranium -kev sib tham.
Raws li, yam khoom twg yuav ib tug geologist hnub siv carbon 14 yos?
Cov pa roj carbon - 14 sib tham yog ib txoj hauv kev los txiav txim lub hnub nyoog ntawm qee yam khoom qub qub qub ntawm cov keeb kwm lom neeg txog li 50,000 xyoo. Nws yog siv nyob rau hauv sib tham tej yam xws li pob txha, ntaub, ntoo thiab tsob nroj fibers uas tau tsim nyob rau hauv lub yav tas los kuj los ntawm tib neeg kev ua ub no.
Cov pob zeb puas tuaj yeem ua cov pa roj carbon hnub?
Geologists tsis siv carbon -raws li radiometric sib tham los txiav txim lub hnub nyoog ntawm pob zeb . Carbon sib tham tsuas yog ua haujlwm rau cov khoom uas muaj hnub nyoog qis dua 50,000 xyoo, thiab feem ntau pob zeb kev txaus siab yog laus tshaj qhov ntawd. Lub sijhawm dhau mus, carbon -14 decays radioactively thiab hloov mus rau nitrogen.
Pom zoo:
Plaub hom xov tooj cua sib tham yog dab tsi?
Cov ntsiab lus 2.1 Uranium-lead dating method. 2.2 Samarium-neodymium yos txoj kev. 2.3 Potassium-argon dating method. 2.4 Rubidium-strontium yos txoj kev. 2.5 Uranium-thorium yos txoj kev. 2.6 Radiocarbon dating method. 2.7 Fission taug kev sib tam txoj kev. 2.8 Chlorine-36 dating method
Dab tsi yog lwm lub npe rau kev sib tham xov tooj cua?
Xov tooj cua sib tham. Los ntawm Wikipedia, dawb encyclopedia. Radiometric dating, radioactive dating los yog radioisotope dating yog cov txheej txheem uas siv rau hnub tim cov ntaub ntawv xws li pob zeb los yog cov pa roj carbon monoxide, nyob rau hauv uas ib tug kab mob radioactive impurities tau xaiv incorporated thaum lawv tsim
Dab tsi yog isotope thiab nws siv li cas hauv xov tooj cua sib tham?
Radiometric dating yog ib txoj kev siv rau hnub tim pob zeb thiab lwm yam khoom raws li qhov paub txog kev lwj ntawm cov isotopes ntawm cov xov tooj cua. Tus nqi decay yog xa mus rau radioactive decay, uas yog tus txheej txheem uas ib tug tsis ruaj tsis khov atomic nucleus poob lub zog los ntawm kev tso tawm hluav taws xob
Cov ntawv xov tooj cua twg yog rau cov pob khoom uas muaj hluav taws xob ntau?
RADIOACTIVE WHITE-I yog qeb qis tshaj thiab RADIOACTIVE YELLOW-III yog qhov siab tshaj. Piv txwv li, ib pob nrog kev thauj mus los ntawm 0.8 thiab qhov siab tshaj plaws ntawm cov hluav taws xob saum npoo ntawm 0.6 millisievert (60 millirems) ib teev yuav tsum dais daim ntawv RADIOACTIVE YELLOW-III
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus