Video: Dab tsi yog qhov zaus ntawm lub teeb liab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ntau zaus yog tus naj npawb ntawm qhov tshwm sim ntawm arepeating tshwm sim hauv ib chav tsev ntawm lub sijhawm. Ntau zaus yog ib qho tseem ceeb parameter siv nyob rau hauv science thiab engineering los qhia tus nqi ntawm oscillatory thiab vibratory phenomena, xws li mechanical vibrations, suab teeb liab (suab), xov tooj cua yoj, thiab lub teeb.
Li ntawd, koj yuav nrhiav tau qhov zaus ntawm lub teeb liab li cas?
Cov mis rau zaus yog: f( zaus ) = 1 / T (lub sijhawm). f = c / λ = yoj speedc (m / s) / wavelength λ (m). Cov mis rau lub sij hawm yog: T (lub sij hawm) = 1 / f ( zaus ). λ = c / f = yoj speedc (m/s) / zaus f (Hz).
Ib yam li ntawd, lub teeb liab siab zaus yog dab tsi? Ntau zaus (HF) yog lub npe ITU rau ntau yam ntawm xov tooj cua zaus electromagnetic tsis ( xov tooj cua waves) nruab nrab ntawm 3 mus rau 30 megahertz (MHz). HF bandis yog ib feem tseem ceeb ntawm shortwave band ntawm zaus , kev sib txuas lus ntawm no zaus feem ntau hu ua shortwave xov tooj cua.
Ib yam li ntawd, qhov zaus ntawm nthwv dej yog dab tsi?
Ntau zaus piav txog tus naj npawb ntawm nthwv dej uas dhau qhov chaw ruaj khov nyob rau hauv ib lub sijhawm. Yog li yog tias lub sijhawm siv rau ib qho yoj kom dhau yog 1/2 thib ob, tus zaus yog 2 per second. Qhov ntsuas hertz, luv Hz, yog tus naj npawb ntawm nthwv dej uas dhau los ntawm persecond.
Dab tsi yog tus qauv rau wavelength?
Lub wavelength tuaj yeem suav nrog cov hauv qab no qauv : wavelength = yoj velocity/frequency. Lub wavelength feem ntau yog qhia nyob rau hauv units ntawm meters. Lub cim rau wavelength yog Greek lambda λ, soλ = v/f.
Pom zoo:
Qhov ceev ntawm lub teeb zaus yog dab tsi?
Wavelength = ceev ntawm lub teeb / zaus = 3 x 108 m / s / 1.06 x 108 Hz = 3 meters - txog 10 feet
Lub ntsiab lus ntawm convolution ntawm ob lub teeb liab yog dab tsi?
Convolution yog ib txoj hauv kev ua lej ntawm kev sib txuas ob lub teeb liab los tsim lub teeb liab thib peb. Nws yog cov txheej txheem tseem ceeb tshaj plaws hauv Digital Signal Processing.Convolution yog qhov tseem ceeb vim nws cuam tshuam txog peb lub cim ntawm kev txaus siab: lub teeb liab tawm tswv yim, cov teeb liab tawm, thiab cov lus teb impulse
Dab tsi yog kev sib raug zoo ntawm wavelength zaus thiab qhov ceev ntawm lub teeb?
Lub wavelength thiab zaus ntawm lub teeb yog ze ze. Qhov siab dua qhov zaus, qhov luv dua lub wavelength. Vim tias txhua lub teeb tsis txav mus los ntawm lub tshuab nqus tsev ntawm tib lub nrawm, tus naj npawb ntawm nthwv dej crests dhau los ntawm ib qho taw tes hauv ib thib ob nyob ntawm qhov wavelength
Dab tsi yog qhov txawv ntawm wavelength ntawm lub teeb liab thiab lub teeb violet?
Violet lub teeb yog hluav taws xob hluav taws xob hluav taws xob nrog wavelengths ntawm 410 nanometers thiab lub teeb liab muaj awavelength ntawm 680 nanometers. Qhov ntau ntawm wavelengths (400 - 700 nm) ntawm lub teeb pom kev yog nyob nruab nrab ntawm lub electromagnetic spectrum (Fig.1)
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua