7
Truong Dai Hoc Su ph4nr Tp.HCM . , :
. . Khoa Vf,t Lf
on rm uoiv QUANG ( L6p crJxnAN )
lql &
Hqc kj,II Ndrn 2006_2007 ( DC thi Hn I) i
Thdigian 120 phrit
I. Lf thuv6t :
cdu I i'rri'h bAy nOi dung Djnh ru0t Kir.chrroff .v'grrTa cta tlirilr ruft.
Cffu 2 : Trinh bAy nguy€n tic ho4t dgng cta au.ng kl .
II. Bii t6p:
cfiu I : Cho rn6t flr6u ki'rr dAy chitit su6t N = I,5 hai mut r6i c6 brtur kinh len luqt re 20cm vd
80cm <t[t trong kh6ng khl Ba div d t6m cria th6u kinh ta zo;-. ;u;;;t'nh6 ^; ;rr;*;;
g6c vdi t4rc chinh vd 6 tru6c rndt ciu thf nh6t 60 cm.
;"rJ;ij6ng thric mflt cau khric xs x6c dinh vi tri ,ti'n ch6t vd rlQ ph6ng tl4i cra a'h qua
b'coi th6u ki'h dAy rtuong duong m$t qua'g h0 <Idng trrc .X6c tlinh 4 di6rn dac biet cria
quallgh0.Ki6rrrhalaiki5tquricdua.V€lrirrlr.
Cf ir 2 : Tia Rongheii c6 budc s6'g i:0,20g A0 bi tian x4 b6i Cacboii.H6y xr{c tljnli :
a.Budc s6ng l.' cria tia Rcrnghen tfur xa dutii g6c 900
i brDdngrrEng ctrc dai c,.ia elccrlon.
i Choh:6,6253.10-34Js,ms:9,1.10-3tKg,c=3.108m/s. ^t\, ; /i,rr\
t ev, 'q r.ru_nvs. #, I \ t, L
-1L l0 -
. ii
( Kh6ng fugc sri dung tdi ligu) .+. d . - "
t\
{",{)f}.t;*''
,', 1r', l' - ,r'-'u t t, , - ///T
s
t, *u,%b* D'2 '