Video: Koj pom eV ntawm lub wavelength li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kuj xam tus wavelength ntawm ib tug dawb electron nrog ib tug kinetic zog ntawm 2 eV . Teb: Cov wavelength ntawm a 2 eV photon yog muab los ntawm: l = h c / Eph Luas = 6,625 x 10-34 x3x 108/(1.6 x 10-19 x 2) = 621 nm.
Tom qab ntawd, koj yuav suav li cas eV Zog?
Nco ntsoov tias 1 eV yog kinetic zog tau los ntawm ib qho hluav taws xob lossis ib qho proton ua raws li qhov sib txawv ntawm 1 volt. Cov mis rau zog hais txog tus nqi thiab qhov sib txawv yog E = QV. Yog li ntawd 1 eV = (1.6 x 10^-19 coulombs)x(1 volt) = 1.6 x 10^-19 Joules.
Qhov thib ob, koj ua li cas thiaj nrhiav tau tus de Broglie wavelength ntawm ib lub tshuab hluav taws xob?
- Qhov loj ntawm ib tug electron yog sib npaug rau 1 kuv, los yog 9.10938356 * 10^(-31) kg.
- Qhov ceev ntawm no electron yog sib npaug rau 1 c, los yog 299 792 458 m / s.
- Muab qhov loj thiab ceev, peb tau txais lub zog ntawm cov particle: p = m * v = 2.7309245 * 10 ^ (-22) kg * m / s.
Ib yam li ntawd ib tug yuav nug, dab tsi yog lub wavelength ntawm ib tug electron ntawm lub zog?
Rau ib hluav taws xob nrog KE = 1 eV thiab so mass zog 0.511 MeV, qhov cuam tshuam DeBroglie wavelength yog 1.23 nm, kwv yees li ib txhiab npaug me dua 1 eV photon.
Dab tsi yog qhov wavelength ntawm 2.3 eV photon?
Cov wavelength ntawm a 2 eV ua photon yog muab los ntawm: l = h c / Eph Luas = 6,625 x 10-34 x3x 108/(1.6 x 10-19 x 2) = 621 nm. qhov twg photon lub zog tau muab sib npaug nrog cov nqi hluav taws xob los hloov lub zog hauv Joule es tsis yog hluav taws xob Volt.
Pom zoo:
Yuav ua li cas koj pom lub kaum sab xis nruab nrab muab qhov chaw thiab lub vojvoog ntawm ib lub sector?
Kev txiav txim siab Central Angle Los ntawm Sector Area (πr2) × (central angle in degrees ÷ 360 degrees) = sector area. Yog hais tias lub hauv paus lub kaum sab xis ntsuas nyob rau hauv radians, lub mis hloov mus ua: sector cheeb tsam = r2 × (central kaum hauv radians ÷ 2). (θ ÷ 360 degree) × πr2. (52.3 ÷ 100π) × 360. (52.3 ÷ 314) × 360
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