Muaj pes tsawg ib nrab neej nws siv rau 6.02 10?

Video: Muaj pes tsawg ib nrab neej nws siv rau 6.02 10?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Nws yuav siv pes tsawg ib nrab neej rau 6.02 x 10 23 nuclei kom lwj mus rau 6.25% (0.376 x 1023 ) ntawm thawj tus naj npawb ntawm nuclei? Nws yuav siv 4 ib nrab neej. 7.

Ib nrab neej Lab.

Tos #	# ntawm cov xov tooj cua (tails up)	Kev twv ua ntej
9	0	Xaus

Tsuas yog li ntawd, ib nrab lub neej ua haujlwm li cas?

Carbon-14 muaj a ib nrab - lub neej ua 5,730y. Qhov ntawd txhais tau tias tom qab 5, 730 xyoo, ib nrab ntawm tus qauv decays. Tom qab lwm 5, 730 xyoo, ib feem peb ntawm cov qauv qub ploj mus (thiab lub voj voog mus ntxiv, thiab ib qho ua tau siv txhua yam xov tooj cua isotope).

Ib yam li ntawd, cov xov tooj ntawm cov xov tooj cua puas txo qis rau ib nrab ntawm nws cov nqi qub hauv ib nrab lub neej? Xov tooj cua lwj txo cov tus naj npawb ntawm radioactive nuclei dhau sijhawm. Hauv ib nrab - lub neej t ₁ _/₂, cov tus lej txo rau ib nrab ntawm nws tus nqi qub . Ib nrab ntawm dab tsi tseem lwj nyob rau tom ntej ib nrab - lub neej , thiab ib nrab ntawm cov hauv qab no, thiab lwm yam.

Ntawm no, pes tsawg feem pua ntawm cov qauv hluav taws xob tseem nyob tom qab peb ib nrab ntawm lub neej?

Tom qab 3 ib nrab-lub neej yuav muaj 12.5% ntawm tus thawj isotope, thiab 87.5% ntawm cov khoom lwj. Tom qab 4 ib nrab-lub neej yuav muaj 6.25% ntawm thawj isotope, thiab 93.75% ntawm cov khoom lwj.

Dab tsi yog ib nrab lub neej ntawm cov tshuaj?

Kev tshem tawm ib nrab - lub neej ntawm ib tug tshuaj yog ib tug pharmacokinetic parameter uas yog txhais raws li lub sij hawm nws yuav siv sij hawm rau lub concentration ntawm cov tshuaj hauv plasma lossis tag nrho cov nyiaj hauv lub cev kom txo tau 50%. Hauv lwm lo lus, tom qab ib qho ib nrab - lub neej , qhov concentration ntawm cov tshuaj nyob rau hauv lub cev yuav ib nrab ntawm qhov pib koob tshuaj.

Pom zoo:

Muaj pes tsawg valence electrons nyob rau hauv nruab nrab atom ntawm astatin?

Xya valence electrons

Muaj pes tsawg guanine bases puas yog 50 lub hauv paus khub ob txoj hlua DNA 100 bases tag nrho muaj yog tias nws muaj 25 adenine bases?

Yog li, muaj tag nrho ntawm 25 + 25 = 50 adenine thiab thymine hauv tag nrho. Qhov ntawd tawm 100− 50 = 50 seem hauv paus. Nco ntsoov tias cytosine thiab guanine daim ntawv cog lus nrog ib leeg, thiab yog li lawv sib npaug ntawm cov nyiaj. Tam sim no peb tuaj yeem faib los ntawm 2 kom tau txais tus lej ntawm guanine lossis cytosine hauv paus

Muaj pes tsawg tus txiv neej tsim cov ntsiab lus muaj nyob rau hauv lub rooj zaum?

Cov khoom siv hluavtaws yog cov uas muaj atomic tooj 95-118, raws li pom hauv ntshav ntawm lub rooj sib tham nrog: cov 24 lub ntsiab lus no tau tsim thawj zaug thaum xyoo 1944 thiab 2010