Video: Vim li cas qhov ceev ntawm lub teeb hloov nyob rau hauv txawv nruab nrab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ceev ntawm lub teeb ua tsis yog hloov , nws yuav tsum tau mus ntau dua nyob rau hauv ib nruab nrab tshaj hauv lub tshuab nqus tsev, Thaum teeb yog hla a nruab nrab , cov electrons nyob rau hauv lub nruab nrab absorbs lub zog los ntawm lub teeb thiab tau zoo siab thiab tso lawv rov qab. Tsuas yog vim li cas vim li cas photon tuaj yeem taug kev ntawm lub teeb ceev yog vim nws yog mass tsawg.
Hais txog qhov no, yog vim li cas qhov ceev ntawm lub teeb hloov?
Ceev ceev Tej zaum yuav tsis tas li, Physicists hais. Einstein txoj kev xav ntawm kev sib txheeb tshwj xeeb ntawm cov ceev ntawm lub teeb , 186, 000 mais ib ob (300 lab meters ib ob). Thiab qhov sib txawv lub teeb ceev yuav hloov lub zog ntawm molecular bonds thiab qhov ceev ntawm nuclear teeb meem nws tus kheej.
Ib sab saum toj no, lub teeb nrawm npaum li cas los ntawm ntau qhov nruab nrab? Lub teeb mus ncig ntawm kwv yees li 300, 000 kilometers ib ob nyob rau hauv lub tshuab nqus tsev vacuum, uas muaj ib tug refractive index ntawm 1.0, tab sis nws slows down mus rau 225,000 kilometers ib ob nyob rau hauv dej (refractive index = 1.3; saib daim duab 1) thiab 200,000 kilometers ib ob. hauv iav (refractive index ntawm 1.5).
Kuj paub, thaum lub teeb hla ntawm ib qho nruab nrab mus rau lwm qhov hloov pauv li cas?
Refraction. Thaum lub teeb mus los ntawm ib qho nruab nrab mus rau lwm qhov , ceev kev hloov , zoo li lub wavelength. Qhov Performance index ntawm refraction kuj tuaj yeem hais nyob rau hauv cov nqe lus ntawm wavelength: Txawm tias qhov ceev kev hloov thiab wavelength kev hloov , qhov zaus ntawm cov teeb yuav tas li.
Lub teeb puas hloov ceev?
Einstein txoj kev xav ntawm kev sib txheeb tshwj xeeb ntawm cov ceev ntawm teeb , 186, 000 mais ib ob (300 lab meters ib ob). Cov ceev ntawm teeb yog tas li, los yog li phau ntawv hais. Tab sis qee cov kws tshawb fawb tab tom tshawb nrhiav qhov ua tau tias qhov no cosmic ceev txwv kev hloov , qhov tshwm sim ntawm qhov xwm txheej ntawm lub tshuab nqus tsev.
Pom zoo:
Vim li cas qhov ceev ntawm lub teeb tsis tas li nyob rau hauv tag nrho cov ntaub ntawv siv?
Puas yog vim li cas qhov ceev ntawm lub teeb yog qhov tsis tu ncua nyob rau hauv tag nrho cov ntaub ntawv siv? Qhov tsuas yog qhov uas cuam tshuam qhov ceev ntawm lub teeb yog qhov ntsuas qhov nruab nrab ntawm qhov nruab nrab uas nws txav mus, thiab rau qhov chaw khoob, tus lej no yog 1.000000 thiab muab qhov siab tshaj plaws ntawm lub teeb rau koj
Dab tsi yog qhov txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv ntawm qhov ntab?
Integers thiab floats yog ob yam sib txawv ntawm cov ntaub ntawv tus lej. Ib tus lej (feem ntau hu ua anint) yog tus lej tsis muaj tus lej lej. Float isa floating-point number, uas txhais tau hais tias nws yog tus lej uas muaj tus lej lej. Floats siv thaum xav tau ntau dua
Koj pom qhov nruab nrab thiab nruab nrab hauv tableau li cas?
Kev sib txuas lus cov ntaub ntawv nrog Tableau los ntawm Ben Jones Qhov nruab nrab (lossis nruab nrab) yog txiav txim siab los ntawm kev suav tag nrho cov txiaj ntsig hauv cov ntaub ntawv teev thiab faib los ntawm tus lej ntawm qhov tseem ceeb. Qhov nruab nrab yog tus nqi nruab nrab hauv cov ntaub ntawv teev nyob rau hauv uas qhov tseem ceeb tau muab tso rau hauv kev txiav txim ntawm qhov loj
Yuav ua li cas wavelength muaj feem xyuam rau qhov ceev ntawm lub teeb nyob rau hauv ib tug nruab nrab?
Qhov ceev ntawm lub teeb nyob rau hauv nruab nrab yog v = cn v = c n, qhov twg n yog nws qhov Performance index ntawm refraction. Qhov no txhais tau tias v = fλn, qhov twg λn yog lub wavelength nyob rau hauv nruab nrab thiab hais tias λn=λn λ n = λ n, qhov twg λ yog lub wavelength nyob rau hauv lub nqus tsev vacuum thiab n yog qhov nruab nrab qhov ntsuas ntawm refraction
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm