Video: Vim li cas photoelectrons muaj lub zog kinetic siab tshaj plaws?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog li cov lub zog siab tshaj plaws a photoelectron ua tau muaj yog tias muab rau nws los ntawm photon, tsawg dua kev ua haujlwm. Cov hluav taws xob los ntawm qhov tob hauv cov hlau yuav raug tso tawm tsawg dua kinetic zog tshaj cov uas twb nyob ntawm qhov chaw. electrons muaj lub siab tshaj plaws kinetic zog = (photon zog ) - kev ua haujlwm.
Ua raws li qhov xav tau, vim li cas thiaj li muaj lub zog kinetic siab tshaj plaws hauv cov nyhuv photoelectric?
Kev soj ntsuam kev soj ntsuam ntawm photoelectric emission nce qhov zaus ntawm qhov teeb meem beam, ua kom tus naj npawb ntawm qhov teeb meem photons tsau (qhov no yuav ua rau muaj kev faib ua feem ntawm zog ) nce lub siab tshaj kinetic zog ntawm photoelectrons emitted.
Tsis tas li ntawd, vim li cas photoelectrons muaj zog kinetic sib txawv? Cov kinetic zog ntawm photoelectrons sib txawv tsuas yog vim lub fact tias (tom qab photoelectric nyhuv muaj coj qhov chaw) tag nrho cov photoelectrons tsis emission tam sim ntawd. Qhov tshwm sim yog lub npe hu ua photoelectric effect thiab cov electrons emitted nyob rau hauv xws li hu ua photoelectrons.
Tsis tas li ntawd, dab tsi yog qhov siab tshaj plaws kinetic zog ntawm cov emitted electrons?
Cov siab tshaj kinetic zog KEe ntawm tawm electrons (photoelectrons) yog muab los ntawm KEe = hf − BE, qhov twg hf yog photon zog thiab BE yog txoj kev khi zog (los yog ua haujlwm ua haujlwm) ntawm cov khoom siv hluav taws xob rau cov khoom siv tshwj xeeb.
Puas yog lub zog kinetic ntawm tag nrho cov photoelectrons tib yam thaum tawm los ntawm qee cov hlau?
A: Cov kinetic zog ntawm photoelectrons yog cov zog ntawm qhov xwm txheej photon rho tawm haujlwm ua haujlwm.
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