Video: Yuav kuaj electromagnetic radiation li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev kuaj EM Vuag. Rau ntes hluav taws xob teb, siv ib tug conducting pas nrig. Cov teb ua rau tsub nqi (feem ntau electrons) kom nrawm rov qab thiab tawm ntawm tus pas nrig, tsim kom muaj qhov sib txawv uas oscillates ntawm qhov zaus ntawm qhov EM zog thiab nrog ib tug amplitude proportional rau lub amplitude ntawm lub yoj.
Xav txog qhov no, ntsuas hluav taws xob electromagnetic li cas?
Kev ntsuas hluav taws xob electromagnetic Zaus yog ntsuas hauv cycles per second, los yog Hertz. Wavelength yog ntsuas hauv meters. Zog yog ntsuas hauv electron volts. Feem ntau ntawm cov xov tooj cua ntawm EM spectrum ntog nyob rau hauv thaj tsam li ntawm 1 cm mus rau 1 km, uas yog 30 gigahertz (GHz) txog 300 kilohertz (kHz) hauv zaus.
Ib sab saum toj no, hom hluav taws xob hluav taws xob dab tsi uas tib neeg tuaj yeem ntes tau? Qhov sib txawv ntawm cov hluav taws xob hluav taws xob tau pom nyob rau hauv electromagnetic spectrum muaj cov xov tooj cua tsis muaj zog, microwaves , infrared tsis muaj zog, pom lub teeb, ultraviolet hluav taws xob, X-rays, thiab gamma rays. Ib feem ntawm electromagnetic spectrum uas peb tuaj yeem pom yog qhov pom lub teeb spectrum.
Ntxiv mus, koj puas tuaj yeem pom hluav taws xob hluav taws xob?
Lub Visible Spectrum Lub teeb pom kev yog lub teeb uas peb pom tau , thiab yog li tsuas yog lub teeb pom tau los ntawm tib neeg lub qhov muag. Gamma rays yog lub teeb muaj zog tshaj plaws nthwv dej pom ntawm lub electromagnetic spectrum . Peb nrhiav tau Gamma rays tso tawm hauv cov tshuaj tiv thaiv nuclear thiab kev sib tsoo.
Electromagnetic hluav taws xob tsim li cas?
Electromagnetic hluav taws xob yog ua thaum lub atom absorbs zog. Lub zog absorbed ua rau ib los yog ntau dua electrons hloov lawv lub zos nyob rau hauv lub atom. Thaum lub electron rov qab mus rau nws qhov qub chaw, ib electromagnetic wave yog tsim. Cov electrons nyob rau hauv cov atoms no ces nyob rau hauv lub zog siab.
Pom zoo:
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
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Yuav ua li cas koj xam qhov ceev ntawm electromagnetic tawg?
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