Video: Yuav ua li cas koj xam qhov ceev ntawm electromagnetic tawg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov ceev ntawm tej lub sij hawm yoj yog cov khoom ntawm nws cov wavelength thiab zaus. v = lwf. Cov ceev ntawm tej electromagnetic tsis hauv qhov chaw dawb yog qhov ceev Luas c = 3 * 108 m/s. Electromagnetic tsis tuaj yeem muaj qhov wavelength λ lossis zaus f ntev li λf = c.
Ntawm no, qhov ceev ntawm electromagnetic tawg yog dab tsi?
Electromagnetic Radiation . Electromagnetic hluav taws xob yog ib hom zog uas feem ntau hu ua lub teeb. Feem ntau hais lus, peb hais tias lub teeb nkag mus rau hauv nthwv dej , thiab tag nrho electromagnetic tawg taug kev tib yam ceev uas yog hais txog 3.0 * 108 meters ib thib ob los ntawm lub tshuab nqus tsev.
Tom qab ntawd, lo lus nug yog, Maxwell tau xam qhov ceev ntawm electromagnetic nthwv dej li cas? Siv qee qhov tsis yooj yim calculus, Maxwell cov Kev sib npaug tuaj yeem siv los qhia tias cov hluav taws xob thiab cov hlau nplaum ua raws yoj kev sib npaug. Cov ceev c of ib electromagnetic yoj yog txiav txim los ntawm qhov tas li ntawm hluav taws xob thiab hlau nplaum uas koj paub zoo: c = 1/(e0m0)1/2 Luas = 2,998 x 108m/s.
Tom qab ntawd, qhov zaus zoo ib yam li qhov ceev ntawm electromagnetic hluav taws xob?
Electromagnetic hluav taws xob taug kev mus tas li ceev , c, sib npaug 3.0 × 108 m / sec. Ntau zaus yog suav tus naj npawb ntawm nthwv dej uas dhau ib qho chaw ruaj khov thaum 1 thib ob (lossis qee qhov kev ntsuas yooj yim ntawm lub sijhawm. Ceev = zaus × yoj ntev.
Puas yog hluav taws xob hluav taws xob muaj teeb meem?
Tsis muaj qhov tsis ntseeg tias qhov luv luv raug rau cov qib siab heev electromagnetic teb tau phom sij rau kev noj qab haus huv. Txawm hais tias muaj kev tshawb fawb dav dav, los txog niaj hnub no tsis muaj pov thawj los txiav txim siab tias raug rau qib qis electromagnetic teb yog phom sij rau tib neeg noj qab haus huv.
Pom zoo:
Yuav ua li cas koj xam qhov ncig ntawm lub ntiaj teb ntawm nws latitude?
Circumference ntawm lub voj voog yog sib npaug rau 2 π r qhov twg r yog nws lub vojvoog. Nyob rau hauv lub ntiaj teb no, lub circumference ntawm tus kheej ntawm ib tug muab latitude yog 2πr(cos θ) qhov twg θ yog lub latitude thiab r yog lub vojvoog ntawm lub ntiaj teb ntawm kab zauv
Yuav ua li cas koj xam lub zog ntawm ib tug electromagnetic yoj?
Lub zog nqa los ntawm ib qho yoj yog proportional rau nws amplitude squared. Rau electromagnetic nthwv dej, qhov no txhais tau hais tias siv tau raws li Iave = cϵ0E202 I ave = c ϵ 0 E 0 2 2, qhov twg Iave yog qhov nruab nrab siv nyob rau hauv W / m2, thiab E0 yog qhov siab tshaj plaws hluav taws xob teb lub zog ntawm lub nruam sinusoidal yoj
Yuav ua li cas koj xam qhov hnyav thiab qhov sib npaug ntawm lub dav hlau?
Ntxiv tag nrho cov sijhawm mus nrhiav lub sijhawm tag nrho. Faib tag nrho lub sijhawm los ntawm qhov hnyav tag nrho kom pom qhov nruab nrab ntawm lub ntiajteb txawj nqus. Nrhiav tag nrho qhov hnyav thiab qhov nruab nrab ntawm lub ntiajteb txawj nqus ntawm qhov nruab nrab ntawm lub ntiajteb txawj nqus daim ntawv qhia hauv koj lub dav hlau POH los txiav txim seb lub dav hlau puas nyob hauv qhov txwv
Yuav ua li cas koj pom qhov tawg qhov Performance index ntawm pob zeb?
Tus naj npawb ntawm cov pob txha pob txha yog muab faib los ntawm qhov ntev thiab tau tshaj tawm tias pob txha ib ko taw lossis pob txha ib 'meter'. Pob Zeb Quality Designation (RQD) [2] yog ib qho kev ntsuas tawg siv nyob rau hauv ntau lub pob zeb kev faib tawm
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm