Electromagnetic Wave vs Radio Waves
Electromagnetic nthwv dej yog ib hom nthwv dej uas muaj nyob hauv qhov xwm txheej. Cov kev siv ntawm electromagnetic tsis muaj qhov kawg. Txoj kev xav ntawm electromagnetism yog ib thaj chaw loj heev hauv cov tshuab qub qub thiab niaj hnub physics, thiab. Cov kev xav ntawm electromagnetism thiab kev paub ntawm electromagnetic nthwv dej thiab xov tooj cua nthwv dej tau siv rau hauv ntau qhov chaw xws li physics, telecommunication, astronomy, optics, relativistic mechanics thiab lwm yam. Hauv tsab xov xwm no, peb yuav tham txog dab tsi electromagnetic nthwv dej thiab xov tooj cua tsis yog, lawv daim ntawv thov, lub ntsiab lus ntawm electromagnetic nthwv dej thiab xov tooj cua tsis, qhov zoo sib xws thiab thaum kawg qhov txawv ntawm electromagnetic nthwv dej thiab xov tooj cua tsis.
Electromagnetic waves
Electromagnetic nthwv dej, feem ntau hu ua EM nthwv dej, tau xub thov los ntawm James Clerk Maxwell. Qhov no tom qab tau lees paub los ntawm Heinrich Hertz uas ua tiav thawj EM nthwv dej. Maxwell tau muab daim ntawv nthwv dej rau hluav taws xob thiab sib nqus nthwv dej thiab ua tiav qhov kev ntsuas ceev ntawm cov nthwv dej no. Txij li thaum lub nthwv dej no sib npaug rau qhov kev sim ntawm qhov ceev ntawm lub teeb, Maxwell kuj tau hais tias lub teeb yog, qhov tseeb, ib daim ntawv ntawm EM nthwv dej. Electromagnetic nthwv dej muaj ob qho tib si hluav taws xob thiab ib qho chaw sib nqus oscillating perpendicular rau ib leeg thiab perpendicular rau cov kev taw qhia ntawm yoj propagation. Txhua qhov hluav taws xob hluav taws xob muaj tib qhov kev tshaj tawm hauv lub tshuab nqus tsev. Qhov zaus ntawm electromagnetic yoj txiav txim siab lub zog khaws cia hauv nws. Tom qab ntawd nws tau pom tias siv quantum mechanics tias cov nthwv dej no yog, qhov tseeb, pob ntawv ntawm nthwv dej. Lub zog ntawm pob ntawv no nyob ntawm qhov zaus ntawm nthwv dej. Qhov no qhib lub teb ntawm nthwv dej - particle duality ntawm teeb meem. Tam sim no nws tuaj yeem pom tias hluav taws xob hluav taws xob tuaj yeem suav tias yog nthwv dej thiab hais. Ib yam khoom uas muab tso rau hauv txhua qhov kub siab tshaj qhov xoom xoom yuav tawm EM nthwv dej ntawm txhua qhov wavelength. Lub zog, uas tso tawm ntau tshaj plaws ntawm photons, nyob ntawm qhov kub ntawm lub cev.
Radio Waves
Yuav kom nkag siab lub tswv yim ntawm xov tooj cua nthwv dej ib qho yuav tsum xub nkag siab lub tswv yim ntawm electromagnetic spectrum. Electromagnetic nthwv dej tau muab faib ua ntau thaj chaw raws li lawv lub zog. X-rays, ultraviolet, infrared, pom, xov tooj cua tsis muaj npe rau qee qhov ntawm lawv. Ib qho spectrum yog zajlus ntawm kev siv zog piv rau lub zog ntawm electromagnetic rays. Lub zog kuj tuaj yeem sawv cev hauv wavelength lossis zaus. Ib qho spectrum txuas ntxiv yog ib qho spectrum uas tag nrho cov wavelengths ntawm cheeb tsam xaiv muaj kev siv zog. Lub teeb dawb zoo meej yog lub spectrum txuas ntxiv mus rau thaj tsam pom. Xov tooj cua tsis yog cov electromagnetic tsis nyob hauv thaj tsam ntawm 300 GHz txog 3 kHz.
Dab tsi yog qhov txawv ntawm Electromagnetic Waves thiab Radio Waves?
• Electromagnetic nthwv dej yog kev tsim cov hlau nplaum thiab cov hluav taws xob oscillating ib txwm rau ib leeg. Xov tooj cua nthwv dej yog ib pawg sub ntawm electromagnetic nthwv dej.
• Xov tooj cua tsis yog siv rau hauv kev soj ntsuam hnub qub, kev xa xov tooj cua thiab ntau lwm yam kev siv. Electromagnetic nthwv dej yog siv nyob rau hauv ntau yam kev siv.
