
duan-hunt kayada

american bhautikshastradnya william duan aanee franklin ell. yanchya navavarun duan-hunt kayada asey naav denyat aale aahe. hunt, ex-rechee kamal varanvarta dete jee ex-reey tubemadhye bramestralangdware utsarjit kelee jaau shakate, excitation voltage "vhee" dware dhatuchya lakshyamadhye electronla gatee deuun.
kamal varanvarta "ν" kamal dware dilee jaate
jeey kiman tarangalambishi sambandhit aahe
jethe "h" haah plankcha sthirank aahe, "e" haah electroncha charge aahe aanee "c" haah prakashacha veg aahe. heey asey dekhil lihile jaau shakateh
yenanya electrondware ksh-kiran utsarjanachya prakriyela inverse photoelectric effect asehi mhanatat.
spashtikaran.
ksh-kiran nalikemadhye, vidyut kshetradvare nirvatamadhye electron vegit kele jaatat aanee 'lakshya' navachya dhatuchya tukadyat takale jaatat. dhatumadhil electroncha veg qamee hott asatana (mandavate) ksh-kiran utsarjit hotat. utpadan varnpatamadhye ksh-kiranancha satatcha varnapat asato, jyat vishisht urjevar atirikt tikshna shikhar asatat (ujavikadil aalekh pahaa). satatche varnapat 'bramestrallung' mule aahe, tarr tikshna shikhare heey lakshyatil anoonshi sambandhit vaishishtyapurn ksh-kiran aahet.
spectrummadhye qamee tarangalambivar (uchch varanvarta) tikshna cutoff asato, jeey yenanya electronchya maryadit urjemule asate. udaharanarth, jarr nalitil pratyek electronla 60 keey. vhee. dware gatee dilee gelee, tarr tee 60 keey. vhee. chee gatij urja prapt karel aanee jevha tee lakshyavar dhadkel tevha tee urja sanvardhanadvare jastit jaast 60 keey. vee. chya urjesah ksh-kiran photon tayar karoo shakate. (hii varchi maryada keval eka ksh-kiran photon utsarjit karoon electron thambanyashi sambandhit aahe. samanyatah electron anek photon utsarjit karato aanee pratyekachi urja 60 keey. eae. vhee. peksha qamee asate.) 60 keey. vhee. kinwa tyapeksha qamee urja asalelya photonchi taranglambi 21 pii. emm. kinwa tyahoon adhik asate, mhanoon ksh-kiran varnapatat aalekhat pahilyapramane agadi toch cutoff asato. haah cutoff satat ('bramestrallung') spectrum aanee vaishishtyapurn tikshna shikhare yaa donhina lagoo hotoh cutoffchya palikade konatyahi prakarcha ksh-kiran nasato. tathapi, satatchya spectramsathi cutoff sarvat spasht aahe.
cutoffche achook sootra electronchi gatij urja aanee ksh-kiran photonchi urja samaan seet karnyapasoon yete.