Video: Kev hloov pauv liab tshwm sim li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Kev hloov pauv liab tshwm sim vim Doppler nyhuv, uas hais tias lub wavelength ntawm lub teeb hloov nyob ntawm seb lub nthwv dej qhov twg los yog txav mus rau los yog deb ntawm lub detector. Cov kws tshawb fawb ntseeg tias lub qab ntuj khwb nthuav dav vim muaj pov thawj ntawm liab hloov lub teeb los ntawm galaxies uas nyob deb ntawm lub ntiaj teb.
Tsuas yog li ntawd, dab tsi yog redshift thiab dab tsi ua rau nws tshwm sim redshift?
Redshift yog thaum lub teeb tsis hloov mus rau qhov kawg liab ntawm lub spectra. Qhov no yog ua rau thaum ib yam khoom, xws li lub galaxy, txav deb ntawm peb. Qhov no qhia tias qhov khoom txav deb ntawm peb.
Qhov thib ob, Red Shift kuaj tau li cas? Astronomers tuaj yeem ntsuas qhov wobble no los ntawm kev siv spectroscopy. Yog tias lub hnub qub tab tom taug kev ntawm peb, nws lub teeb yuav tshwm sim blueshifted, thiab yog tias nws mus deb, lub teeb yuav redshifted. Qhov no ua haujlwm nyob rau hauv cov xim yuav tsis hloov lub meej xim ntawm lub hnub qub txaus kom pom ntawm qhov muag liab qab.
Tom qab ntawd, lo lus nug yog, dab tsi yog qhov hloov pauv txoj kev xav?
' Liab hloov ' yog lub ntsiab lus tseem ceeb rau astronomers. Lub sij hawm tuaj yeem nkag siab qhov tseeb - lub wavelength ntawm lub teeb yog ncab, yog li lub teeb pom tau tias 'hloov' ntawm lub teeb. liab ib feem ntawm spectrum. Ib yam zoo li no tshwm sim rau lub suab nthwv dej thaum lub hauv paus ntawm lub suab txav mus rau tus neeg soj ntsuam.
Kev hloov pauv liab yog dab tsi hauv cov ntsiab lus yooj yim?
' Liab hloov ' yog lub ntsiab lus tseem ceeb rau astronomers. Cov lub sij hawm tuaj yeem nkag siab qhov tseeb - lub wavelength ntawm lub teeb yog ncab, yog li lub teeb pom tau tias yog ' ua haujlwm ' rau ntawm liab ib feem ntawm spectrum. Ib yam zoo sib xws tshwm sim rau lub suab nthwv dej thaum lub hauv paus ntawm lub suab txav mus rau tus neeg soj ntsuam.
Pom zoo:
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