Rau lub cev opaque, transmissivity yog zero i.e. τ=0.
Dab tsi yog qhov hloov pauv ntawm cov ntaub ntawv opaque?
Cov khoom siv xa tawm hluav taws xob txhais tau hais tias theem ntawm pob tshab ntawm cov khoom khoom. … Cov khoom opaque uas tau ntim los ntawm cov khoom pob tshab tuaj yeem ua qauv thiab. Qhov no txawm tso cai rau "zes" ntawm ntau txheej ntawm opaque thiab pob tshab khib nyiab.
Dab tsi yog qhov opaque?
1 tsis kis light; tsis pob tshab los yog translucent. 2 tsis pom lub teeb; tsis muaj luster lossis ci; npub. 3 tsis xa cov hluav taws xob hluav taws xob, xws li hluav taws xob lossis hluav taws xob hluav taws xob, lossis suab.
Dab tsi yog qhov opaque nto hauv hluav taws xob?
Thaum lub hnub ci hluav taws xob tsoo ib qho chaw, cov photons tuaj yeem nqus tau, cuam tshuam, lossis xa mus. Nyob rau hauv cov ntaub ntawv ntawm opaque (tsis pob tshab) cov ntaub ntawv, tsis muaj ib tug ntawm cov photons kis tauYog hais tias cov khoom yog tsaus thiab dull (tsis reflective los yog ci), tsawg heev ntawm cov photons yog reflected.
Dab tsi yog qhov nqus qhov cuam tshuam kev xa tawm?
Absorptivity (α) yog ib qho kev ntsuas ntawm ntau npaum li cas ntawm cov hluav taws xob absorbed los ntawm lub cev. Reflectivity (ρ) yog ib qho kev ntsuas ntawm ntau npaum li cas yog reflected, thiab transmissivity (τ) yog ib qho kev ntsuas ntawm ntau npaum li cas dhau los ntawm cov khoom… Emissivity (ε) yog ib qho kev ntsuas ntawm ntau npaum li cas thermal hluav taws xob lub cev tawm mus rau nws ib puag ncig.
