rrUdrvc DHSp rp. n6 cui rranur
KHoA vAr r-Y
..--_-:-iw-@
F3Q. T)
CQng hoi Xi hQi Chfi nghia ViQt nam ( -
D6c l6p - TrJ do - Hanh phfc
BS rru Hec pnAN: vAr ry rudNc KE _ Hp cuNHAN
Thdi gian lim bdi: 120 phrit
CAu I : Khf electron trong Fe.
U Dung c6ng thric tt4 t5 tr4ng th6i dk(p) cria c6c electron c6 ttQ l6n dQng lugng
trong khoingp viLp + dp dE mn truc fidp dQng luqng Fermi vd suy ra bi6u thric cria n[ng
luqng Fermi.
2/ Cho bii5t so electron ho'6 tr! cta m6i nguyon ta Feh 2 vd mric n6ng luqng Fermi cria
Fe ld ll,l eV- Cho h=6,625x10-3a,/.s, kh6i luqng electron : 9,lx l0-3rftg: H6y tinh mflt rlQ
nguy6n tft Fe. Cho : leV = l,6x 10-reJ
Cffu II: S{ ne! trung binh cria khi Bose ti tu&ng
llHay viist bi6u thric vd vE sg biiSn thiOn cfia s6 hpt trung binh N theo ndng lucrng cria
he khi Bose li tudng 6 nhiet d0 z vd c6 th6 ho6 hqc p. Gihithich.
2/vc ton cunq mQt dd thi cdc <ludng bi6u di6n cria rV theo n6ng lugng cria hQ 0 nhiet
3l ve tr€n cirng mOt tl6 thi c6c,$1r*q bi6u diSn cria rV theo ndng lugng ctia hQ c6 th6
ho6 hgc p vd d c6c *91 uo r1 (tluong fian nJg vd zz (rrucrng drrr n6t), nti rri t . ciai thfch.
g Dao tlQng t'fr ilidu hoi lugmg tr?
------t-6
Hey vrgt ba s6 hqng dAu ti6n cria ham.t6ng th5ng k€ cua dpo dQng tri <tidu hod tuytin
tinh.luqng tt. Tfnh n6ng lugng trung binh ctia aao i'6ng tinay ,,i bG, d;il;.
'HC't-
Ghi chri: o C6c c6u I,If, vi III ilQc lgp nhau.
o Sinh vi6n khdng iltf{c st? aUnEid- .
fi -+l''1 bn D,7
