YBrightness vs Luminosity
Brightness thiab luminosity yog ob lub ntsiab lus tseem ceeb ntawm lub teeb thiab hluav taws xob. Muaj ntau qhov kev siv ntawm ci ntsa iab thiab luminosity hauv thaj chaw xws li astronomy, physics, astrophysics, cosmology, kev ua liaj ua teb, huab cua thiab txawm tias kev yees duab. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv cov ntsiab lus ntawm kev ci ntsa iab thiab luminosity thiaj li ua tau zoo hauv cov teb. Brightness thiab luminosity feem ntau yog tham txog lub teeb, tab sis cov kev xav no kuj tuaj yeem siv rau txhua hom hluav taws xob hluav taws xob. Qee qhov kev xav ntawm luminosity thiab brightness tau yooj yim to taub, tab sis qee qhov kev xav xav tau qee qhov kev nkag siab ntawm kev ua lej thiab physics, cov theories siab heev yog tawm ntawm cov kab lus no. Hauv tsab xov xwm no, peb yuav tham txog dab tsi luminosity thiab brightness yog dab tsi, lawv cov ntsiab lus, dab tsi yog cov kev suav nrog luminosity thiab brightness, lawv daim ntawv thov, zoo sib xws thiab thaum kawg qhov txawv ntawm brightness thiab luminosity.
Luminosity
Luminosity yog ib lo lus nquag siv hauv thaj chaw xws li kev yees duab, duab kos duab thiab astronomy. Qee zaum, lo lus yog siv rau lwm cov ntsiab lus tsis yog lub ntsiab lus ntawm lo lus. Lub ntsiab txhais ntawm luminosity yog lub zog hluav taws xob ib lub sijhawm. Chav tsev ntawm luminosity yog watt. Xwb, peb kuj tuaj yeem nqa cov units ua joules ib ob. Hauv kev yees duab, luminosity yog siv nyob rau hauv cov ntsiab lus ntawm luminance, uas yog ntsuas raws li lub candela ib cheeb tsam. Txawm li cas los xij, luminosity ntawm ib yam khoom tsis nyob ntawm qhov kev ncua deb ntawm qhov nws tau pom. Luminosity yog ib qho cuab yeej ntawm qhov khoom. Nyob rau hauv astronomy, lub luminosity ntawm cov hnub qub yog ntsuas los ntawm lub tsev hu ua solar luminance (L0). Qhov no yog sib npaug rau 3.846 × 1026 W. Luminosity kuj sib raug rau qhov loj ntawm lub hnub qub, uas txhais tau tias yog qhov pom tseeb luminosity ntawm thaj chaw pom lub teeb nyob rau hauv lub electromagnetic spectrum. Kuj tseem muaj lub tswv yim ntawm spectral luminosity, uas txhais tau tias yog lub zog tawg ntawm ib chav tsev zaus ib lub sijhawm. Lub luminosity ntawm ib yam khoom, uas muaj ib tug deg cheeb tsam A, thiab saum npoo uas muaj ib tug uniform kub T yog muab los ntawm E=σ AT4, qhov twg σ yog tus Stephan-Boltzmann tas li thiab qhov ntsuas kub yog ntsuas hauv kelvin.
Brightness
Brightness yog ib lo lus nquag siv hauv kev kawm txog kev yees duab, hnub qub thiab txhua qhov xwm txheej kho qhov muag. Lo lus brightness feem ntau yog hais txog qhov pom lub teeb. Brightness tau raug txhais raws li lub zog nqa los ntawm electromagnetic nthwv dej los ntawm ib cheeb tsam ib zaug. Xav txog qhov khoom taw tes ntawm luminosity L, uas txhais tau tias nws radiates L watts ib ob. Thaum lub hollow imaginary kheej kheej yog kos ntawm qhov deb r los ntawm qhov khoom nruab nrab, thaj tsam ntawm tus kheej yog 4πr2. Yog li ntawd, lub zog nqa ib cheeb tsam ntawm ib lub sij hawm yog L / 4πr2. Brightness yog ntsuas nyob rau hauv watt ib square meter. Ob qho tib si radiated nthwv dej thiab reflected nthwv dej tuaj yeem pab ua kom ci ntsa iab. Qhov ci ntsa iab ntawm ib qho khoom ua raws li txoj cai square inverse.
Qhov txawv ntawm luminosity thiab brightness yog dab tsi?
• Luminosity yog ib qho khoom vaj khoom tsev, uas txhais tau hais tias nws yog ywj siab ntawm qhov deb thiab lwm yam; Ntawm qhov tod tes, qhov ci ntsa iab yog qhov ua haujlwm ntawm ob qho tib si luminosity thiab qhov deb ntawm qhov khoom.
• Brightness yog ntsuas nyob rau hauv watt ib chav tsev cheeb tsam, thaum luminosity yog ntsuas nyob rau hauv watt.
• Ob lub nthwv dej nthwv dej thiab cov nthwv dej uas muaj kev cuam tshuam ua rau muaj kev ci ntsa iab, thaum lub luminosity tsuas yog nyob ntawm cov nthwv dej tawg xwb.
