2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Tus qauv no tau sim los ntawm cov kws tshawb fawb Geiger thiab Marsden hauv xyoo 1909. Lawv tau teeb tsa txheej nyias nyias ntawm cov ntawv ci kub thiab tua cov alpha particles - cov xov tooj cua nrogtus nqi zoo - ntawm kub. … Qhov tseeb, cov alpha hais tau deflected ntau tshaj qhov xav tau - ib txhia zoo li thaws yuav luag rov qab.
Kev soj ntsuam kev soj ntsuam ntawm Geiger-Marsden tawg ua kev sim yog dab tsi?
Qhov kev sim Geiger-Marsden (tseem hu ua Rutherford kub foil xyaum ua haujlwm) yog qhov chaw ua yeeb yam ntawm cov kev sim uas cov kws tshawb fawb tau kawm tias txhua lub atom muaj lub nucleus qhov twg tag nrho nws cov nqi zoo thiab feem ntau ntawm nws. pawg yog concentrated.
Qhov kev sim Geiger-Marsden nrhiav tau dab tsi?
Tseem hu ua Geiger-Marsden Experiments, qhov kev tshawb pom tau koom nrog ntau qhov kev sim ua los ntawm Hans Geiger thiab Ernest Marsden hauv qab Ernest Rutherford. Nrog Geiger thiab Marsden qhov kev sim ua pov thawj, Rutherford tau txiav txim siab tus qauv ntawm lub atom, nrhiav pom lub atomic nucleus.
Dab tsi yog qhov tshwm sim ntawm Geiger thiab Marsden alpha tawg kev sim?
Geiger thiab Marsden tau qhia tias tus naj npawb ntawm cov alpha uas tau tawg ua haujlwm raws li kev ua haujlwm ntawm lub kaum sab xis yog zoo ib yam nrog me me, concentrated zoo nucleus. Rau cov ces kaum saum toj no 140 degrees, lub nucleus tshwm sim raws li tus nqi zoo, yog li cov ntaub ntawv no tsis ntsuaslub nuclear loj.
Vim li cas peb thiaj siv cov ntawv nyiaj nyias nyias hauv Geiger-Marsden sim?
Godl ntawv siv hauv Geiger-marsden sim yog li 10^(-8) tuab. Qhov no ua kom. Cov ntaub ntawv tawg tau txheeb xyuas los ntawm kev siv rutherford tus qauv nuclear ntawm lub atom. Raws li cov ntawv kub nyias nyias, nws tuaj yeem xav tias α-particles yuav raug kev txom nyem tsis ntau tshaj li ib qho tawg thaum lawv hla dhau nws.
Pom zoo:
Dab tsi ntawm qhov tshwm sim hauv qab no tau sim ua pov thawj los ntawm?
The Meselson thiab Stahl kev sim yog qhov kev sim ua pov thawj tias DNA rov ua dua yog ib nrab kev saib xyuas ib nrab kev saib xyuas Semiconservative replication piav qhia lub tshuab ntawm DNA rov ua dua hauv txhua lub hlwb paub. … Cov txheej txheem no hu ua semi-conservative replication vim hais tias ob daim ntawv luam ntawm tus thawj DNA molecule raug tsim.
Qhov twg hauv qab no tshwm sim hauv kev tsim khoom ua ntej?
A. Kev tsim khoom ua ntej yog cov haujlwm ua tiav ntawm cov khoom lag luam, tshwj xeeb tshaj yog cov yeeb yaj kiab lossis kev tshaj tawm xov xwm ua ntej kev tsim tawm tag nrho pib. Cov ntsiab lus ntawm kev tsim yeeb yaj kiab xws li tsab ntawv, kev tsim, kev tshawb nrhiav qhov chaw, khoom siv thiab cov neeg ua haujlwm, thiab cov npe txhaj tshuaj txhua yam tshwm sim thaum tsim ua ntej.
Thaum twg tsis pom kev tshwm sim hauv kev sim tshuaj?
Kev tsis pom kev tshwm sim thaum 'dig muag' raug tshem tawm, thiab cov neeg tshawb nrhiav thiab/lossis cov neeg koom tau raug ceeb toom tias qhov kev kho mob twg tus neeg koom tau txais. Kev tsis pom kev txhais li cas hauv kev sim tshuaj?
Yuav varenicline tshwm sim hauv kev sim tshuaj?
Kev kuaj zis toxicology ntawm kev kawm Hnub 7, 21, thiab 35 tau qhia tias muaj kev ua raws li kev noj tshuaj ntau rau cov neeg tau txais txiaj ntsig varenicline. Tag nrho cov qauv kuaj tau ntsuas qhov ntsuas tau ntawm varenicline tab sis muaj qhov sib txawv ntawm cov neeg koom nrog tau sau tseg.
Cyproheptadine puas tuaj yeem tshwm sim hauv kev sim tshuaj?
Cyproheptadine koob tshuaj yog nyob ntawm qhov hnyav (tshwj xeeb tshaj yog rau cov menyuam yaus thiab cov hluas), thiab txhua qhov kev hloov pauv tuaj yeem cuam tshuam rau cov koob tshuaj. Cov tshuaj no tuaj yeem ua rau koj kom muaj kev kuaj tshuaj tsis tseeb.
