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 . 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. <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