Phase Vs Vs Pab Pawg Tshaj Tawm
Phase nrawm thiab pab pawg tshaj tawm yog ob lub ntsiab lus tseem ceeb hauv physics. Lawv ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm xws li yoj mechanics, optics, quantum mechanics thiab txawm tias suab engineering. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv ob theem kev tshaj tawm thiab pab pawg tshaj tawm kom ua tau zoo hauv cov haujlwm no. Nyob rau hauv tsab xov xwm no, peb yuav los tham txog dab tsi theem tshaj tawm thiab pab pawg tshaj tawm yog, cov ntsiab lus ntawm pab pawg tshaj tawm thiab theem nrawm, lawv cov ntawv thov, lawv qhov sib xws thiab thaum kawg qhov txawv ntawm ob.
Phase Velocity yog dab tsi?
Phase nrawm yog ib lub tswv yim sib tham hauv kev nthuav tawm ntawm nthwv dej. Lub sijhawm tshaj tawm ntawm nthwv dej yog qhov tshaj tawm ntawm "theem" uas propagates. Txhawm rau kom paub meej, xav tias lub crest ntawm nthwv dej, uas yog taug kev hauv x ntawm lub axis. Cov theem tshaj tawm yog x tivthaiv ntawm qhov nrawm ntawm qhov chaw xaiv ntawm lub crest. Qhov no kuj tuaj yeem tau txais los ntawm kev faib cov wavelength los ntawm lub sijhawm coj mus rau ib lub wavelength kom dhau qhov chaw xaiv. Lub sijhawm no yog sib npaug rau lub sijhawm oscillation, uas ua rau nthwv dej. Tam sim no xav txog tus qauv sine yoj A kev txhaum (wt - kx), qhov twg w yog qhov nrawm nrawm ntawm qhov chaw, t yog lub sijhawm, k yog tus lej nthwv dej (tus naj npawb ntawm qhov ua tiav wavelengths ib qhov ntev ntawm 2π), thiab x yog txoj haujlwm. pe x-axis. Nyob rau hauv lub crest, wt - kx yog sib npaug zos rau xoom. Yog li ntawd, theem tshaj tawm (x / t) yog sib npaug rau w / k. lej, tus nqi p=wt – kx yog theem ntawm nthwv dej.
Pab Kev nrawm yog dab tsi?
Pab pawg tshaj tawm tau tham nyob rau hauv superposition ntawm nthwv dej. Yuav kom nkag siab txog pawg ceev ib tus yuav tsum xub nkag siab lub tswv yim ntawm superposition. Thaum ob nthwv dej cuam tshuam ib leeg hauv qhov chaw, qhov tshwm sim oscillation yog qhov nyuaj dua li tus cwj pwm sine. Particle ntawm ib qho chaw oscillates nrog txawv amplitudes. Qhov siab tshaj plaws amplitude yog lub unison ntawm ob lub amplitudes ntawm thawj nthwv dej. Qhov tsawg kawg nkaus amplitude yog qhov tsawg kawg nkaus qhov sib txawv ntawm ob qhov qub amplitudes. Yog tias ob lub amplitudes sib npaug, qhov siab tshaj plaws yog ob zaug qhov amplitude thiab qhov tsawg kawg nkaus yog xoom. Txhawm rau kom pom tseeb, cia peb xav tias ob lub suab hloov pauv yog tib yam amplitude thiab ntau zaus. Qhov no ua rau lub nthwv dej nrog qhov ntau zaus yuav tsum tau ntim rau hauv nthwv dej nrog qhov qis dua. Qhov no ua rau ib pawg ntawm nthwv dej ntim rau hauv ib lub hnab ntawv. Lub nrawm ntawm lub hnab ntawv no yog pab pawg tshaj tawm ntawm nthwv dej. Nws yuav tsum tau muab sau tseg tias, rau ib tug sawv nthwv dej, cov pab pawg neeg tshaj tawm yog xoom. Rau cov pab pawg tshaj tawm kom xoom ob lub nthwv dej yuav tsum yog tib lub zaus thiab lawv yuav tsum muaj cov lus qhia tawm ntawm kev mus los.
Qhov sib txawv ntawm pab pawg tshaj tawm thiab theem nrawm yog dab tsi?
• Theem tshaj tawm yog txhais rau ob qho tib si, ib nthwv dej thiab nthwv dej superimposed.
• Pab pawg tshaj tawm tsuas yog txhais rau cov nthwv dej superimposed.
• Pab pawg tshaj tawm yog qhov nrawm ntawm nthwv dej nrog qis dua, tab sis theem tshaj tawm yog qhov nrawm ntawm nthwv dej nrog ntau zaus.
