Cov yam ntxwv ntawm lub teeb

Teebpropagates ntawm ib tug ceev ntawm 300,000 km ib ob.

Lub teeb propagates ntawm kwv yees li ntawm 300,000 km ib ob. Zoo kawg li, lub teeb tuaj yeem ncig lub ntiaj teb 7.5 zaug hauv ib pliag xwb. Cov yam ntxwv ntawm lub teeb no yog ua haujlwm nyob rau hauv ntau yam kev siv, nrog rau kev sib txuas lus kho qhov muag, uas xa cov ntaub ntawv tseem ceeb hauv lub sijhawm luv luv. Txawm li cas los xij, txawmteeb, qhov chaw ceev tshaj plaws paub rau tib neeg, tuaj yeem hla tsuas yog 0.3 millimeters hauv ib trillionth ntawm ib thib ob (picosecond) hauv lub tshuab nqus tsev. Nyob rau hauv xyoo tas los no, txoj kev tshawb fawb ntawm optical phenomena tshwm sim nyob rau hauv ib lub sij hawm luv luv tau dhau los ua qhov tseem ceeb hauv kev qhuab qhia ntawm physics, chemistry, biology, thiab lwm yam.
1 millisecond sib npaug 1/1000 ntawm ib thib ob, 1 microsecond sib npaug 1/1,000,000 ntawm ib thib ob, 1 nanosecond sib npaug 1/1,000,000,000 ntawm ib thib ob, thiab 1 picosecond sib npaug 1/1,000,000,000 ntawm ib thib ob

Lub teeb - teeb meem sib cuam tshuam

Teebnthuav tawm ntau tus cwj pwm thaum muaj kev cuam tshuam nrog cov khoom.
Hauv lub tshuab nqus tsev, xws li qhov chaw sab nraud tsis muaj cov khoom siv, lub teeb propagates nyob rau hauv ib tug linear yam. Lub teeb nthuav tawm ntau tus cwj pwm thaum cuam tshuam nrog dej, huab cua, thiab lwm yam khoom; nws yog "absorbed," "hloov," "reflected," thiab "scattered." Thaum twgteebcuam ​​tshuam nrog cov teeb meem, ib feem ntawm lub teeb yog absorbed los ntawm qhov teeb meem thiab hloov mus rau thermal zog. Yog hais tias cov khoom uas lub teeb impinges yog pob tshab, lub teeb tivthaiv uas tseem unabsorbed nyob rau hauv cov khoom yog "hloov" ntawm (b) thiab tshwm nyob rau sab nraud ntawm cov khoom. Yog hais tias cov khoom nto yog tiaj tus, xws li daim iav, "reflection" tshwm sim; Txawm li cas los xij, yog tias qhov chaw tsis sib xws nrog cov pits thiab protrusions, lub teeb "scatters."
Lub teeb kis tau, pom, lossis tawg ua rau peb lub qhov muag pom cov xim thiab cov qauv ntawm cov khoom.