Qhov twg ntawm cov no yog cov roj ua tau rau lub foob pob tawg?

Cov txheej txheem:

Qhov twg ntawm cov no yog cov roj ua tau rau lub foob pob tawg?
Qhov twg ntawm cov no yog cov roj ua tau rau lub foob pob tawg?
Anonim

Nuclear roj Plutonium-239 thiab uranium-235 yog cov isotopes ntau tshaj plaws siv hauv riam phom nuclear.

Yuav siv roj dab tsi hauv lub foob pob?

Cov foob pob atomic siv hauv Nyij Pooj xyoo 1945, thiab cov foob pob lossis cov cuab yeej sim nyob rau hauv xya xyoo tom ntej, nyob ntawm qhov fission ntawm uranium-235 lossis plutonium-239, feem ntau tom qab. Cov txiaj ntsig tawg ntawm txhua qhov sib npaug li ntawm txog li ob peb kaum txhiab tons ntawm cov pa tawg TNT.

Dab tsi mus rau hauv lub foob pob atomic?

Nuclear fission tsim lub foob pob atomic, riam phom ntawm kev puas tsuaj loj uas siv lub zog tso tawm los ntawm kev sib cais ntawm atomic nuclei. Thaum ib leeg dawb neutron ntaus lub nucleus ntawm ib lub atom ntawm cov khoom siv hluav taws xob xws li uranium lossis plutonium, nws khob ob lossis peb ntxiv neutrons dawb.

Uranium 238 siv tau dab tsi?

Depleted uranium (uranium uas muaj feem ntau U-238) tuaj yeem siv rau hluav taws xob tiv thaiv lossis ua cov phiaj xwm hauv cov riam phom riam phom. Nws tuaj qhov twg? U-235 thiab U-238 tshwm sim nyob rau hauv yuav luag txhua pob zeb, av, thiab dej. U-238 yog daim ntawv ntau tshaj plaws nyob rau hauv ib puag ncig.

Yuav ua li cas yog tias koj noj 1 gram ntawm uranium?

Yuav ua li cas yog tias koj noj ib gram ntawm uranium? Cov hlau yuav hnov mob nrog cov kua qaub hauv koj lub plab, ua rau koj burp hydrogen. Kev haus ntau, txawm li cas los xij, tuaj yeem tua koj lossis tawm ntawm kojua rau mob plab hnyuv thiab plab.

Pom zoo:

Nthuav cov khoom
Puas yog homomorphism tib yam li isomorphism?
Nyeem ntxiv

Puas yog homomorphism tib yam li isomorphism?

Isomorphism yog homomorphism tshwj xeeb. Greek keeb kwm "homo" thiab "morph" ua ke txhais tau tias "zoo tib yam." Muaj ob qhov xwm txheej uas homomorphisms tshwm sim: thaum ib pab pawg yog ib pawg ntawm lwm pawg;

Yuav tau sawv los yog tshwm sim?
Nyeem ntxiv

Yuav tau sawv los yog tshwm sim?

Peb hom tshwm sim yog arise, sawv, arisen. Nws yog siv hauv cov ntsiab lus tseem ceeb: Ib lub sijhawm tshwm sim thiab nws txiav txim siab los ua txoj haujlwm hauv Brussels. Ib qho teeb meem tshwm sim nrog kuv daim ntawv hla tebchaws. Koj siv arose hauv kab lus li cas?

Nyob hauv qab ceg cov leeg nqaij gastrocnemius khoov?
Nyeem ntxiv

Nyob hauv qab ceg cov leeg nqaij gastrocnemius khoov?

Cov leeg nqaij gastrocnemius flexes ko taw ntawm pob qij txha- uas yog nws ua rau taw taw ko taw nqes los ntawm khoov nws ntawm pob taws pob taws, xws li thaum koj sawv ntawm koj. cov ntiv taw. Qhov kev txiav txim no hu ua plantar flexion. Lub gastrocnemius kuj flexes ceg ntawm lub hauv caug sib koom.