NL*h eao tao' Vai tli rrqt Hoc phdn thi: VQt ly Nguy0n tir vd h4t nhdn Thoi gian lim bii: 150 phrit kh6ng tO ttrOi gian ph6t d0 Ciu 12 di6m a Tir thi nghiQm nhiSu x4 cria chum h4t vi md
Trang 1TRUONG DAI HQC SUPHAM T".HCM
Br rro 16r NGHTEp DAr Hgc sp cuirvlr eur rqAvr zlrt
NL*h eao tao' Vai tli rrqt
Hoc phdn thi: VQt ly Nguy0n tir vd h4t nhdn
Thoi gian lim bii: 150 phrit kh6ng tO ttrOi gian ph6t d0
Ciu 1(2 di6m)
a) Tir thi nghiQm nhiSu x4 cria chum h4t vi md hdy thi€t lap ta€-'thric bAt dinh
//
b) Sft dung hQ thirc bAt dinh Heisenberg d6nh gi6 mftydang lugng nho nhAt ctra
electron trong nguy6n tu hydro Coi d0 U6t Onn vC b6n kiffna electron li b5n kinh Bohr
hne2 = 0,529.10-8 cm
Ciu2 (3 di6m)
a) Xac dinh giA tri m6men qfly dao I
"ua.electron trong nguydn tu hidr6 o trang
th6i kich thich bi6t ring ndng loo-ng kich thich truyAn cho nguy6n tu tu tr4ng thfi co bin li
10,2 eV vi c6 chri y tdi quy tic lgc ltra Tim chc gi|tri hinh chiOu m6men qu! dao L, tr6n truc Oz o trang thdi trOn
b) Trinh biy thi nghiQm Stern vir Gerlach vO ph6t hiOn spin cua hat vi m6 Tt' d6 hay
A.
n6u c6c s6 lugng tu c6 thO d[c trung cho electron trong nguy6n ttr
c) X6c dinh d0 l6n md men toin phdn o c6c trang thrli trOn vh chiing to vdc to m6 men toirn phdn kh6ng song song vcri v6c to md men fir cta electron
Cfiu :- - 3 (2,5 tli6m)
fit;; Qp phuong ph,lp Cto tI€ xac dlnh tudi m5u vdt 96.
_ b) X5c <I!nh *9i :y" nhtnq piu 96 cfi n€u.bi€t ho4t tinh ri6ng (ho4t dO c.ua mQt kg
96 trong mQt gi6y) cria d6ng vi Cro trong chfng bing 3/5 ho4t tinh iieng cia ddng vi ney trong nhirng cdy 96 vria m6i ch{t Chu k} ben rd cria c6ch4tnhdn Cla Uing SSZO nam
Cffu 4 (2,5 rli6m)
Ngudi ta th6y ring chi c6 cdc br?c xa gamma (7) duoc phSt ra khi cho m6t chirm hat neutron mang ndng luong 3,2MeV ddp vdo bia lBe, cfuctia Gamma ndy c6 phucrng hqp vdi
phucrng chuyOn dQng cira neutron mQt g6c 0 = 600 (86 qua hiQu img tucrng O6i tinti;.
a) H6y vi6t phuong trinh cria phdn ring tr6n
b) Tim ndng luong ctra cdc birc xa gamma ph6t ra vd ndng lugng cira hat nhdn tao
thinh sau phin ring?
Cho cdc sA lieu sou: M,r" = 9,012186tt, M,,8"= 10,013534u, M,= 1,00866512
lu:931,5 MeVic2
- Sinh vi6n khdne a*q;;;;;il;ff?;;i;;;;;: -:
- Cin b$ coi thi khdng giii thich gi th6m
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