VII. M~CH T6 HQP VI m~N Til (IC-INTEGRATED CIRCUITS) Ky thu~t vi dien tit 10 nganh ky thu~t dien tit moi pMt tri~n tren 15 nam
24. Trinh bay cau tao cua b9 ngau h<;Jp quang di(ln.
25. Neu d.!!\.c diem, cach phan lo~i m~ch 16 h<;Jp IC, cac nguyen tik cd ban de xay dlfng 1 vi mach. 1 vi mach.
26. Phan tich d~c diem cong ngh(l che t~o IC, U'U nhl,fdc diem cua tlIng lo~i.
Chl1ang 3
D1ENTHANH
Di¢n thanh lit. ph an hqc nghicll CtTu cau l':l0, nguyen 19 Lim vi~c va cOng (h,mg ella d.c thiel h~ di~n lhanh nht! micn), loa, 6ng nghr.:.
I. KHAI NltM CHUNG vi!, AM THANH 1. Nguon goe am thanh
Khi La dung tay b~t van day dan, day dim rung l~n va phat fa li6ng. Tieng MII1 ngan lIi:l.i, cho de'n khi day di:m het rung thl am thanh cling tal. N (l'u La go
If(ing. m;;tt Lrt:ing rung len va cfing phat fa licng .. v.v.
NhlI v~y La co th~ kCt lu~n: Am lhanh Iii do v~t th~ rung {h)ng. pluil fa Licng va Hlm IfuyCn di Lrong kh6ng khL Sb dt lai La Ilghc dlIqc am lhanh lil nhb co mang nhi. Milng nhi n6i lien v6i h~ than kinh Lrung lIang.
Uin song am thanh tit v~t the: rung dl')ng phat fa, duqc Ian truycn Lrong
khOng gian, toi tai La lam rung d(lng mang nhi then dung nh!p di¢u rung d(mg
cila v~l Lh0 <fa phat fa lieng. Nha do tai La nghc dlIgc am thanh.
Am thanh cfing Ian truydn dlf(,1C trong khCmg khl, chat h"mg, chat ran, nhlIng kh6ng truydn Ian trong khoang chan kh6ng,
M()t s6 chcl'L truydn dan am thUllh kcm. Cae chat (Hin am kcm thU(Hlg 13 IO<:J.i mdm nhu x6p, h6ng, d<:J., ci'> kh(), Ok chat nay g9i Iil. ch.ft hut am, dlf(,1c dung M 16t tlf(mg cae r<;lp M.l, dc ph(mg 00. am ... dd hut am, giiim tiCllg vang.
V~n t6e lruycn Ian cua am thanh phl,l thu(lc vito chat truydn am.