Video: Yuav ua li cas anti nodes tsim nyob rau hauv ib tug nyob ruaj ruaj nthwv dej?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov nodes thiab antinodes hauv a sawv nthwv dej qauv (zoo li tag nrho cov ntsiab lus raws nruab nrab) yog tsim raws li qhov tshwm sim ntawm kev cuam tshuam ntawm ob nthwv dej . Cov nodes yog ua ntawm qhov chaw uas muaj kev cuam tshuam kev puas tsuaj tshwm sim. Antinodes , ntawm qhov tod tes, yog ua ntawm qhov chaw uas muaj kev cuam tshuam tsim nyog tshwm sim.
Khaws qhov no hauv kev txiav txim siab, dab tsi yog cov nodes thiab antinodes nyob rau hauv ib qho chaw nres tsheb?
A node yog ib qho point nrog a sawv nthwv dej qhov twg yoj muaj qhov tsawg kawg nkaus amplitude. Piv txwv li, hauv ib txoj hlua vibrating guitar, qhov kawg ntawm txoj hlua yog nodes . Antinodes yog tsim nyob rau hauv qhib ciam teb thiab hais tias ntawm cov ntsiab lus muaj siab tshaj plaws amplitude.
Ib tug kuj yuav nug, qhov tsawg kawg nkaus nyob deb ntawm ib lub ntawm thiab ib qho Antinode uas tsim nyob rau hauv ib tug nyob ruaj ruaj yoj? Cov nrug ntawm ob nyob sib ze nodes los yog ob tug nyob sib ze antinodes yog sib npaug rau ib nrab ntawm lub wavelength (Daim duab 5). 1/4 ntawm lub wavelength. Cov nyob deb ntawm ib lub node thiab lwm yam antinode hauv a nyob ruaj nrees yog 5cm. luas = 4 x 5 cm = 20 cm.
Ua raws li qhov kev pom no, yuav ua li cas lub nthwv dej nyob ruaj khov tsim?
Sawv nthwv dej yog tsim los ntawm superposition ntawm ob mus ncig nthwv dej ntawm tib zaus (nrog tib lub polarization thiab tib lub amplitude) taug kev nyob rau hauv opposite lus qhia. Antinodes yog cov ntsiab lus ntawm a nyob ruaj nrees uas oscillate nrog siab tshaj plaws amplitude. Nodes yog cov ntsiab lus ntawm xoom amplitude.
Muaj pes tsawg cov nodes nyob hauv ib nthwv dej?
Qhov no sawv nthwv dej yog hu ua lub hauv paus zaus, nrog L = λ 2 L = dfrac{lambda}{2} L = 2λ?L, sib npaug, pib feem, lambda, muab faib los ntawm, 2, kawg feem, thiab muaj ob nodes thiab ib tug antinode.
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