2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Qhov zaus ntawm nthwv dej yog qhov sib npaug ntawm nws qhov wavelength. Qhov ntawd txhais tau hais tias nthwv dej uas muaj zaus muaj lub wavelength luv, thaum nthwv dej nrog ib zaus tsis tshua muaj wavelength ntev.
Yuav ua li cas lub wavelengths muaj zog qis dua?
Qhov ntev ntawm lub wavelength qhia li cas? (Short wavelengths muaj zog ntau dua, hos ntev wavelengths muaj tsawg zog.) 4. UV hluav taws xob muaj lub wavelength luv luv, luv dua li pom lub teeb.
Yuav ua li cas yoj twg muaj qhov ntev tshaj plaws wavelength tab sis qis tshaj zaus?
Ntawm txhua hom hluav taws xob hluav taws xob hluav taws xob, xov tooj cua nthwv dej muaj qhov qis tshaj plaws thiab qhov ntev tshaj plaws wavelength. Cov huab cua ntawm lub ntiaj teb yog pob tshab rau xov tooj cua tsis muaj wavelengths ntawm ob peb millimeters mus txog nees nkaum metres.
Yuav ua li cas wavelength tsawg zaus muaj?
Low zaus (LF) yog ITU tsim rau xov tooj cua zaus (RF) nyob rau hauv qhov ntau ntawm 30–300 kHz. Txij li thaum nws cov wavelengths nyob ntawm 10-1 km, feem, nws tseem hu ua kilometer band lossis kilometer yoj. LF xov tooj cua tsis tshua muaj teeb liab attenuation, ua rau lawv haum rau kev sib txuas lus nyob deb.
Puas ntev wavelength txhais tau tias ceev dua?
Ntshai luv txav nrawm dua thiab muaj zog dua, thiab nthwv dej ntev dua tawm mus qeeb dua thiab muaj zog tsawg. Ib sab ntawm qhov sib txawv frequencies thiab lengths ntawm lub teebnthwv dej, lawv kuj muaj qhov sib txawv.
Pom zoo:
Puas yog cov dej khov ntev ntev dua li cov dej khov nab kuab?
Lwm qhov sib txawv loj ntawm glacials thiab interglacials yog cov kev hloov hauv dej hiav txwv. Thaum lub sij hawm glacial, cov dej hiav txwv poob qhov nruab nrab ntawm 100m raws li cov dej evaporated thiab khaws cia rau hauv cov glaciers loj hlob thiab cov ntawv dej khov.
Puas yog n95 lub qhov ncauj qhov ntswg nrog lub qhov nqus pa muaj kev nyab xeeb?
Puas yog nws hnav N95 lub ntsej muag lub ntsej muag nrog lub qhov nqus pa los tiv thaiv kuv thiab lwm tus los ntawm COVID-19? Yog, N95 lim lub ntsej muag lub ntsej muag yuav tiv thaiv koj thiab muab kev tswj hwm los tiv thaiv lwm tus. NIOSH-pom zoo N95 filtering facepiece respirator nrog lub exhalation valve muaj kev tiv thaiv tib yam rau tus neeg hnav li ib qho uas tsis muaj lub valve.
Puas dua zaus nthwv dej nrawm dua?
Sib piv ob nthwv dej ntawm tib lub wavelength, ntau zaus yog txuam nrog kev txav nrawm. Sib piv ob nthwv dej ntawm qhov sib txawv wavelengths, ntau zaus tsis yog ib txwm qhia tau nrawm dua, txawm tias nws tuaj yeem ua tau. Cov nthwv dej sib txawv tuaj yeem muaj qhov sib txawv.
Puas yog qhov ntev ntawm lub sijhawm ntev?
Cov chav nyob ntawm thaj tsam ntawm ib lub duab plaub yog tib yam li nws qhov ntev uas feem ntau muab hauv meters, centimeters, ntiv tes, lossis yards. Lub perimeter yog sib npaug rau ciam teb ntawm cov duab plaub uas suav nrog cov qauv: Perimeter=Length + Length + Dav + Dav=2(Length + Dav).
Puas coherent nthwv dej muaj tib lub wavelength?
Coherence: Ob lossis ntau qhov chaw hu ua coherent yog tsis yog lawv muaj tib zaus thiab tib lub wavelength, tab sis lawv kuj nyob rau theem. Cov chaw sib koom ua ke puas muaj tib zaus? Nyob rau hauv physics, ob qhov chaw nthwv dej sib txuas yog tias lawv qhov zaus thiab qhov nthwv dej zoo ib yam.
