BQ GIAO DUC VA DAO TAO Ho vd t€n thi sinh:DAIHSCHUE .bpqd So bdo danh: rci, rnr ruyEN srNH sAU DAr rrec NAu zorz @qt t M6n thi: Vat lf ry tttuy6t ddnh cho: Cao hqc Thdi gian ldm bdi 180
Trang 1BQ GIAO DUC VA DAO TAO Ho vd t€n thi sinh:
DAIHSCHUE
.bpqd
So bdo danh:
rci, rnr ruyEN srNH sAU DAr rrec NAu zorz @qt t)
M6n thi: Vat lf ry tttuy6t (ddnh cho: Cao hqc) Thdi gian ldm bdi 180 philt
Ciu 1 Trqng th6i kich thich thrt nh6t cria dao ttQng trt didu hda 1 chidu rlugc m6 ti bsi him s6ng:
I ^ ^ - - t t t 1
\ l / 4
V \ = , t z L E e ' - , t r o n g o 6 C = [ y g l C = ^ l ! 9 r
\ r i t ) ' \ h
a Tinh circ gi6 ta rrung binh G d va nghiQm lai hQ thric b6t dinh giira to.a rIQ vd xung lugng
b Xric dinh dQng ndng trung binh f vi thi! nAng rung binh Z; tu d6 suy ra ndng luqng Ecua trpg tluii kfch thich ndy
Cho bi6t: I, = le ^- x'dx =;,/+, le-a'x46c = -'
^ ^ _ : Z \ a ' _ r " 0 a Ciu 2' Goi L,,Lr,L,theo thf t.u ld toan tE hinh chi6u m6men xung lugng cria hat vi m6 trdn ba trpc tqa d$ DA-c4c @escartes) ve I H torin tu trinh phuong m6men xung lugng, nguoi ta dinh n $ia c6c toan tu ,* : L, + iLr:L_ : L, - iLy
, D.Ua vdo cric h€ thrtc giao horin gitra circ torin tu hinh chi6u m6men xung lugng, hdy chung mmnrang:
l r ^ | ^ l ^ ^ | ^ l ^ ^ |
g'.,1-)=2nt":lL,,i.l=hi.;Li,,L-l= -nt- va t = i-i + f; +h1,.
Ciu 3 Ttr phAn b6 Maxwelt theo ciic hinh chi6u cua v4n tiic, hay r{rt ra hdm ptrrin b6 Maxwell theo modul vfn tlic vd xric dinh cac v6n t6c d4c trung cira phrin bi5 ndy
C6u 4 Cho phen b6 chinh tic luong trt cua hp dang fiCt c6 s6 h4t kh6ng <t6i Wr =""p{V ^Erl.t a t Trong c16 E ld ndng luqrig cua hQ 6 trang thiik; ry vd d ld c6c th6ng s6 cua ph6n b6
a Tim bitiu thric cua t6ng mng ttlii Z th6a mdn h6 thric V = -ehz
b Ttd6 suy raphuong trinh Gibbs-Helmh olv E =y -e!^, ' 4 0 voi Eh nrng luqngtrung binh
-;-lugng tu cria h6; vi hg thfrc nhiQt aO"g !={:V, tong d6 V duqcggi ld trung binh
oa oa
lugng trl cria luc suy rQng theo th6ng s6 ngodi a cua h0
c N€u f nghia vft lf cria c6c thdng st5 y vd d mA kh6ng can gia rhich
, C6u 5 Tim n5ng lugng cira m6t dao ttQng tu didu hda tuytin tinh luqng tu mOt chiAu Sri dgng c6ng thric Planck hdy rut ra dinh lu6t chuy6n d&i Wien
Ghi chrt: Cdn b0 coi thi kh6ng gidi thich gi thAm.