2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Joseph John Thomson (J. J. Thomson, 1856-1940; saib daim duab ntawm American Institute of Physics) tau lees paub dav dav tias yog tus neeg nrhiav pom hluav taws xob.
Leej twg hu ua electron?
(Lub sij hawm "electron" yog coined nyob rau hauv 1891 los ntawm G. Johnstone Stoney los qhia txog chav tsev ntawm tus nqi pom hauv kev sim uas dhau hluav taws xob los ntawm cov tshuaj; nws yog Irish physicist George Francis Fitzgerald uas tau tawm tswv yim hauv xyoo 1897 tias lo lus raug siv rau Thomson lub cev nqaij daim tawv.)
JJ Thomson nrhiav tau electrons li cas?
J. J. Thomson qhov kev sim nrog cov kab hluav taws xob cathode tau pom tias tias txhua lub atoms muaj me me tsis zoo them subatomic hais lossis electrons. Thomson's plum pudding qauv ntawm lub atom muaj qhov tsis zoo-them electrons embedded nyob rau hauv ib tug zoo-them "kua zaub."
Leej twg nrhiav tau hluav taws xob hauv Is Nrias teb?
J. J. Thomson hauv xyoo 1897. Hauv kev sim nrog Crookes, lossis cathode ray, raj, nrhiav pom cov hluav taws xob. Nws pom tias cov kab hluav taws xob cathode raug them tsis zoo.
Electron thawj hu ua dab tsi?
Lub sijhawm xyoo 1800 nws tau pom tseeb tias cov nqi hluav taws xob muaj lub ntuj tsim, uas tsis tuaj yeem faib ua lwm yam ntxiv, thiab xyoo 1891 Johnstone Stoney tau thov kom nws lub npe "electron." Thaum J. J. Thomson nrhiav pom lub teeb particle uas nqa qhov nqi ntawd, lub npe "electron" tau siv rau nws.
Pom zoo:
Leej twg thawj zaug pom tuberculosis?
On March 24, 1882, Dr. Robert Koch tshaj tawm qhov kev tshawb pom ntawm Mycobacterium tuberculosis, cov kab mob ua rau tuberculosis (TB). Lub sijhawm no, TB tua ib ntawm txhua xya tus neeg nyob hauv Tebchaws Meskas thiab Europe. tuberculosis pib li cas?
Tus thawj coj twg thawj zaug tsim peev ntawm delhi?
Teb tiav: Lub peev ntawm Delhi yog thawj zaug tsim los ntawm huab tais, Anangapala los ntawm Tomara Dynasty. Tomara Dynasty yog ib qho ntawm cov dynasties thaum ntxov medieval ntawm sab qaum teb Is Nrias teb. Leej twg yog thawj Delhi sultan?
Thaum twg pom kab mob plawv thawj zaug?
Thawj piav qhia hauv 1768 los ntawm William Heberden, nws tau ntseeg los ntawm ntau tus neeg muaj qee yam ua rau cov ntshav ncig hauv cov hlab ntsha, txawm tias lwm tus xav tias nws yog ib qho mob tsis zoo, Raws li Canadian Journal of Cardiology.
Leej twg thawj zaug pom nqaij npuas kib?
Raws li cov txheej txheem tiag tiag ntawm kev ntxiv ntsev rau nqaij npuas, uas yog qhov yooj yim tshaj plaws ntawm nqaij npuas kib, Suav thaum ubyog thawj tus tsim nqaij npuas kib, thiab muaj cov ntaub ntawv sau tseg ntawm no hom nqaij npuas kib thaum ntxov li 1500 BC.
Leej twg thawj zaug pom gadolinium?
Gadolinium yog cov khoom siv tshuaj nrog lub cim Gd thiab tus lej atomic 64. Gadolinium yog cov hlau dawb-dawb thaum oxidation raug tshem tawm. Nws tsuas yog me ntsis malleable thiab yog ib qho khoom siv tsis tshua muaj hauv ntiaj teb. Gadolinium reacts nrog atmospheric oxygen los yog noo noo maj mam tsim ib txheej dub.
