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[email protected] r h tn , lp, hc sinh trng, tnh
BI TON CC TR IN XOAY CHIU KH ( DNH CHO HS T IM 9+10)
BI TON HT NHN KH ( DNH CHO HC SINH T IM CAO )
Cu 1: Nng lng ta ra ca 10g nhin liu trong phn ng + + +17,6MeV l
E1 v ca 10g nhin liu trong phn ng + + +2 +210 MeV l E2.Ta c:A.
E1>E2 B. E1= 4E2 C. E1=12E2 D. E1 = E2Cu 2: Cho mt ht nhn khi
lng A ang ng yn th phn r thnh hai ht nhn c khi lng B v D (vi B <
D). Cho tc nh sng trong chn khng l c. ng nng ca ht B ln hn ng nng
ht D lA. B.
C. D.
Cu 3. Ngi ta trn 2 ngun phng x vi nhau. Ngun phng x c hng s phng
x l 1, ngun phng x th 2 c hng s phng x l 2. Bit 2 = 2 1. S ht nhn
ban u ca ngun th nht gp 3 ln s ht nhn ban u ca ngun th 2. Hng s
phng x ca ngun hn hp l.A. 1,21. B. 1,51. C. 31. D. 2,51.Cu 4; o chu
k bn r ca mt cht phng x, ngi ta cho my m xung bt u m t . n thi im ,
my m c xung, n thi im my m c xung. (Mt ht b phn r, th s m ca my tng
ln 1 n v). Chu k bn r ca cht phng x ny xp x bng:
A. 6,90h. B. 0,77h. C. 7,84h. D. 14,13h
Cu 5: Ht nhn U234 ang ng yn trng thi t do th phng x ( v to thnh
ht X. Cho nng lng lin kt ring ca ht (, ht X v ht U ln lt l 7,15
MeV, 7,72 MeV v 7,65 MeV. Ly khi lng cc ht tnh theo u xp x s khi ca
chng. ng nng ca ht ( bng
A. 12,06 M B. 14,10 MeV.
C. 15,26 MeV. D. 13,86MeV.
Cu 6: Dng p c ng nng bn vo ht nhn ng yn gy ra phn ng: . Phn ng
ny ta ra nng lng bng . Ht nhn v ht bay ra vi cc ng nng ln lt bng v
. Tnh gc gia cc hng chuyn ng ca ht v ht p (ly gn ng khi lng cc ht
nhn, tnh theo n v u, bng s khi).
A. . B. . C. . D. .Cu 7: o chu k bn r ca mt cht phng x , ngi ta
dng my m xung. My bt u m ti thi im t = 0. n thi im t1 = 7,6 ngy my
m c n1 xung. n thi im t2=2t1 my im c n2=1,25n1. Chu k bn r ca lng
phng x trn l bao nhiu?
A. 3,8 ngy B. 7,6 ngy C. 3,3 ngy D. 6,6 ngy
Cu 8. Ngi ta ho mt lng nh dung dch cha ng v phng x 15O (chu k bn
r T= 120s ) c phng x bng 1,5mCi vo mt bnh nc ri lin tc khuy u. Sau
1 pht, ngi ta ly ra 5mm3 nc trong bnh th o c phng x l 1560 phn
r/pht. Th tch nc trong bnh bng xp x bng: A. 5,3 lt B. 6,25 lt C.
2,6 lt D. 7,5 lt Cu 9: Bn mt ht proton c khi lng mp vo ht nhn ng
yn. Phn ng to ra hai ht nhn X ging nhau bay ra vi vn tc c cng ln v
c phng vung gc vi nhau. Nu xem gn ng khi lng ht nhn theo n v u bng
s khi ca n th t s tc Vca ht X v V ca ht proton l:
A.
B.
C. * D. Cu 10. l cht phng x c chu k bn r T = 15 gi. xc nh th tch
mu trong c th, ngi ta bm vo mu mt ngi 10cm3 mt dung dch cha Na vi
nng 10-3mol/lt (khng nh hng n sc khe ngi). Sau 6 gi ngi ta ly ra 10
cm3 mu v tm thy 1,875.10-8 mol ca Na. Gi s vi thi gian trn th cht
phng x phn b u, th tch mu trong c th l:A. 3,8 lt B. 5 lt C. 4 lt D.
3,5 lt
Cu 11. Ngi ta dng ht nhn proton bn vo ht nhn bia ang ng yn gy ra
phn ng to thnh hai ht nhn ging nhau bay ra cng ng nng v theo cc hng
lp vi nhau mt gc 120. Bit s khi ht nhn bia ln hn 3. Kt lun no sau y
l ng?
A. Khng d kin kt lun.
B. Phn ng trn l phn ng thu nng lng.
C. Nng lng trao i ca phn ng trn bng 0.
D. Phn ng trn l phn ng to nng lng.
Cu 12: Ht nhn X phng x ( v bin i thnh ht nhn bn Y. Ti thi im t
ngi ta thy trong mt mu kho st , t s khi lng ca cht X v cht Y bng a.
Xem khi lng ht nhn theo n v u gn ng bng s khi ca n . Vo thi im t +
2T th t s ny trong mu kho st ni trn l
A. *B. a + 3 C.
D. 2a
Cu 13: Ra224 l cht phng x. Bit rng c mi ht nhn Ra224 b phn r l
pht ra mt ht (i km vi mt ht nhn khc). Lc ban u ta dng m0 = 1 gam
Ra224 th sau 7,3 ngy ta thu c V = 75 cm3 kh hli iu kin tiu chun.
Tnh chu k bn r ca Ra224:
A. 0,365 ngyB. 3,65 ngyC. 365 ngyD. 36,5 ngy
Cu 14. Cho phng x: , ht nhn con c ng nng 0,085Mev, bit Th230 ng
yn. Ly khi lng gn ng ca cc ht nhn tnh bng n v u c gi tr bng s khi
ca chng. Tnh nng lng ta ra khi tng hp c 4,48(l) kh heli iu kin tiu
chun. A.1,64.109J. B. 9,42.1012J. C. 1,64.1012J.D. 9,42.1010J.
Cu 15. Mt nh my in ht nhn c cng sut pht in 0,5(GW), dng nng lng
phn hch ca ht nhn U235 vi hiu sut 35%. Trung bnh mi phn hch to ra
nng lng 200 (MeV). Hi trong mt nm (365 ngy) hot ng nh my tiu th mt
khi lng U235 nguyn cht l bao nhiu.
A. 2333,4kg
B.269,2kg
C.269204,2kg
D. Cu 16: Bn mt ht prtn vo ht nht ang ng yn. Phn ng ht nhn to ra
hai ht ging nhau c cng tc v hp vi phng chuyn ng ca prtn gc 300. Ly
khi lng cc ht nhn theo n v u bng s khi. T s ln vn tc ca ht prtn v
ca ht X lCu 17: Ht ntron c ng nng 3,6MeV va chm vi ht nhn ng yn gy
ra phn ng ht nhn. Phn ng ny sinh ra hai ht c ng nng bng nhau, bay
ra theo hai hng hp vi nhau gc 1600. Coi khi lng ca cc ht tnh theo n
v u gn bng s khi ca chng. Nng lng m phn ng ny ta ra lA. 9,56MeVB.
7,46MeVC. 11,32MeVD. 14,92MeV
Cu 18: Bit sn phm phn r ca l . Xem nh trong t nhin Urani ch gm
hai ng v trn. Bit rng khi cn bng phng x c thit lp th chim t l 0,006
% trong qung Urani t nhin, chu k bn r ca l nm. Chu k bn r ca l
A. nmB. nmC. nmD. nm
Cu 19: Ht nhn phng x v bin i thnh mt ht nhn . Bit cht phng x c
chu k bn r l T. Ban u ch c mt lng cht nguyn cht, c khi lng m0. Sau
thi gian phng x , khi lng cht Y c to thnh l . Gi tr ca l:
A. = 4TB. = 2TC. = TD. = 3T
Cu 20: Califorlia (Hoa k) gn vt nt San-anras thng xuyn c xy ra
ng t. Nm 1979, ngi ta ly mt mu thc vt b hy dit do ng t gy ra v o
phng x ca chng nh ng v (c chu k bn r T = 5700 nm), thu c kt qu l
0,233 Bq. Bit phng x ca t khng b chn vi cha thc vt cn sng lun khng
i v bng 0,255 Bq. Nm xy ra ng t l
A. 1327. B.1237. C. 1271. D. 1371.
Cu 21: Gi s ban u c mt mu phng x X nguyn cht, c chu k bn r T v
bin thnh ht nhn bn Y. Ti thi im t l gia ht nhn Y v ht nhn X l . Ti
thi im th t l l
A.
B.
C.
D.
Cu 22: ng v phng x (. Mt mu phng x ban u trong thi gian 5 pht c
190 nguyn t b phn r nhng sau 3 gi trong thi gian 1 pht c 17 nguyn t
b phn r. Xc nh chu k bn r ca cht .
A. 2,5 h. B. 2,6 h. C. 2,7 h. D. 2,8 h.
Cu 23 : Liu lng chiu x c nh ngha bng tch s nguyn t phng x v
khong thi gian chiu x. Mt bnh nhn iu tr bng ng v phng x, dng tia
dit t bo bnh. Thi gian chiu x ln u l t = 20 pht, c sau 1 thng th
bnh nhn phi ti bnh vin khm bnh v tip tc chiu x. Bit ng v phng x c
chu k bn r 4 thng v vn dng ngun phng x trong ln u. Ln chiu x th 3
phi tin hnh trong bao lu bnh nhn c chiu x vi cng mt lng tia nh ln
u?A. 28,2 pht. B. 24,2 pht. C. 40 pht. D. 20 pht.
Cu 24: Bn mt ht ( vo ht nhn ang ng yn gy ra phn ng: . Nng lng ca
phn ng ny bng -1,21MeV. Gi s hai ht sinh ra c cng vect vn tc. ng
nng ca ht ( l: (xem khi lng ht nhn tnh theo n v u gn ng bng s khi
ca n)
A. 1,36MeVB. 1,65MeVC. 1,63MeVD. 1,56MeVCu 25. Cho chm notron bn
ph ng v bn ta thu c ng v phng x . ng v phng x 56Mn c chu k bn r T =
2,5 h v pht x ra tia - . Sau qu trnh bn ph bng ntron kt thc ngi ta
thy trong mu trn t s gia s nguyn t 56Mn v s lng nguyn t 55Mn =
10-10. Sau 10 h tip theo th t s gia nguyn t ca hai loi ht trn l
A. 1,25.10-11
B. 3,125.10-12C. 6,25.10-12
D. 2,5.10-11Cu 26: Mt mu radium nguyn cht 88Ra226 c khi lng m =
1g, chu k bn r T1 = 1620 nm, phng x cho ht nhn con X. Ht nhn X va
to ra li phn r vi chu k bn r T2 = 3,82 ngy. Sau mt thi gian, ngi ta
thy khi lng ht nhn X khng i. Khi lng ht nhn X khi l
A. 4,64 mg.B. 6,46 g.C. 4,64 g.D. 6,46 mg.
Cu 27: Gi s ban u c mt mu phng x X nguyn cht, c chu k bn r T v
bin thnh ht nhn bn Y. Ti thi im t l gia ht nhn Y v ht nhn X l k. Ti
thi im th t l l
A. k + 4.B. 4k/3.C. 4k+3.D. 4k.
Cu 28: Cht phng x poolooni pht ra tia v bin i thnh ch . Cho chu
k ca l 138 ngy. Ban u (t = 0) c mt mu plni chuyn cht. Ti thi im t1,
t s gia s ht nhn plni v s ht nhn ch trong mu l . Ti thi im t2 = t1
+ 276 ngy, t s gia s ht nhn plni v s ht nhn ch trong mu l
A. .
B. .
C. .
D. .
Cu 29: Ban u mt mu cht phng x X nguyn cht. thi im t1 c s ht nhn
cht phng x X phn r. n thi im , th s ht nhn cha b phn r ch cn so vi
ht nhn ban u. Chu k bn r ca cht l:
A. 25 s.B. 400 s.C. 50s.D. 200 s.
Cu 30: Bn ht nhn ( c ng nng 18 MeV vo ht nhn ng yn ta c phn ng .
Bit cc ht nhn sinh ra cng vc t vn tc. Cho m= 4,0015u; m= 1,0072u;
m= 13,9992u; m=16,9947u; cho u = 931 MeV/c2. ng nng ca ht prtn sinh
ra c gi tr l bao nhiu?
A. 0,111 MeVB. 0,555MeVC. 0,333 MeVD. p s khc
Cu 31:Theo thuyt tng i, mt lectron c ng nng bng mt na nng lng
ngh ca n th lectron ny chuyn ng vi tc bng
A. 2,75.108 m/s.
B. 2,24.108 m/s.
C. 1,67.108 m/s.
D. 2,41.108 m/s.
Cu 32: C hai mu cht phng x A v B thuc cng mt cht c chu k bn r T
= 138,2 ngy v c khi lng ban u nh nhau . Ti thi im quan st , t s s
ht nhn hai mu cht .Tui ca mu A nhiu hn mu B l
A. 199,8 ngyB. 199,5 ngyC. 190,4 ngyD. 189,8 ngy
Cu 33: Cho phn ng nhit hch: + n, Bit ht kh , , nc trong t nhin c
ln 0,015% D2O, vi khi lng ring ca nc l 1000kg/m3, 1u=931,5 MeV/c2,
NA=6,022.1023 mol-1. Nu ton b c tch ra t 1m3 nc lm nhin liu cho phn
ng trn th nng lng ta ra l:
A. 1,863.1026 MeV. B. 1,0812.1026 MeV. C. 1,0614.1026 MeV. D.
1,863.1026 J.Cu 34: o chu k bn r ca 1 cht phng x - ngi ta dng my m
electron. K t thi im t=0 n t1= 2 gi my m ghi dc N1 phn r/giy. n thi
im t2 = 6 gi my m dc N2 phn r/giy. Vi N2 = 2,3N1. tm chu k bn r.p
nA 3,31 gi. B 4,71 gi C 14,92 gi D 3,95 gi
Cu 35:Bn ph hatj anpha vo ht nhn nito14-7 ang ng yn to ra H1-1 v
O17-8. Nng lng ca phn ng l -1,21MeV.Gi s hai ht sinh ra c cng vecto
vn tc. ng nng ca ht anpha:(xem khi lng ht nhn tnh theo n v u gn bng
s khi ca n)A1,36MeV B:1,65MeV C:1.63MeV D:1.56MeV
Cu 36: Mt khi cht phng x .trong gio u tin pht ra n1 tia phng xak
,t2=2t1gi tip theo n pht ra n2 tia phng x.Bit n2=9/64n1.Chu k bn r
ca cht phng x trn l:
A.T=t1/4 B.T=t1/2 C.T=t1/3 D.T=t1/6
Cu 37: Hai cht phng x (1) v (2) c chu k bn r v hng s phng x tng
ng l T1 v T2; 1 v 2 v s ht nhn ban u N2 v N1. Bit (1) v (2) khng
phi l sn phm ca nhau trong qu trnh phn r. Sau khong thi gian bao
lu, phng x ca hai cht bng nhau?
A.
B.
C.
D.
Cu 38. xc nh lng mu trong bnh nhn ngi ta tim vo mu mt ngi mt lng
nh dung dch cha ng v phng x Na24( chu k bn r 15 gi) c phng x 2(Ci.
Sau 7,5 gi ngi ta ly ra 1cm3 mu ngi th thy n c phng x 502 phn
r/pht. Th tch mu ca ngi bng bao nhiu? A. 6,25 lt B. 6,54 lt C. 5,52
lt D. 6,00 lt
Cu 39: Cht phng x c chu k bn r 138,4 ngy. Ngi ta dng my m s ht
phng x m cht ny phng ra. Ln th nht m trong (t = 1 pht (coi (t
0,75
Cu 54: . Tim vo mu bnh nhn 10cm3 dung dch cha c chu k bn r T =
15h vi nng 10-3mol/lt. Sau 6h ly 10cm3 mu tm thy 1,5.10-8 mol Na24.
Coi Na24 phn b u. Th tch mu ca ngi c tim khong:
A. 5 lt. B. 6 lt. C. 4 lt. D. 8 lt.
Cu 55: Trong cc mu qung Urani c ln ch Pb206 v U238. Chu k bn r
ca U238 l 4,5.109 nm. Khi trong mu c 20 nguyn t U th c 4 nguyn t Pb
th tui ca mu qung lA. 1,42.109 nm B. 2,1.109 nm C. 1,83.109 nm D.
1,18.109 nm
Cu 56: Dng ht Prtn c ng nng = 5,45 MeV bn vo ht nhn Beri ng yn
to nn phn ng: + + . H li sinh ra bay theo phng vung gc vi phng
chuyn ng ca Prtn. Bit ng nng ca Hli l = 4MeV v khi lng cc ht tnh
theo n v u bng s khi ca chng. ng nng ht nhn Liti c gi tr:
A. 46,565 MeV ; B. 3,575 MeV C. 46,565 eV ;
D. 3,575 eV.
Cu 57: C 0,10mol plni 210Po c t trong mt bnh kn cha mt lng ln kh
nit. Chm ht , phng ra t ngun phng x plni, bn ph ht nhn nit gy ra
phn ng (1): 4 +14N ( 17O +1H Gi s, c hai ht phng ra th c mt ht gy
ra phn ng (1). Sau khong thi gian bng mt chu k bn r ca plni (138,4
ngy), th tch (ktc) ca lng kh hir c to ra nh phn ng (1) bngA. 0,28l.
B. 0,56 l. C. 1,12 l. D. 0,14 l.
Cu 58: Cho phn ng ht nhn . Ht nhn ng yn, ntron c ng nng Kn = 2
Mev. Ht v ht nhn bay ra theo cc hng hp vi hng ti ca ntron nhng gc
tng ng bng = 150 v = 300. Ly t s gia cc khi lng ht nhn bng t s gia
cc s khi ca chng. B qua bc x gamma. Hi phn ng ta hay thu bao nhiu
nng lng ?
A. Thu 1,66 Mev.B. Ta 1,52 Mev.C. Ta 1,66 Mev.D. Thu 1,52
Mev.
Cu 59: U238 phn r thnh Pb 206 vi chu k bn r 4,47.10^9 nam .Mt
khi cha 93,94.10^-5Kg v 4,27.10^-5 Kg Pb .Gi s khi lc
u hon ton nguyn cht ch c U238.Tui ca khi l:
A.5,28.10^6(nm) B.3,64.10^8(nm)
C.3,32.10^8(nam) B.6,04.10^9(nm)
Cu 60. Ngi ta dng ht proton bn vo ht nhn 73Li ng yn, gy ra phn
ng
11P + 73Li ( 2( . Bit phn ng ta nng lng v hai ht ( c cng ng nng.
Ly khi lng cc ht theo n v u gn bng s khi ca chng. Gc ( to bi hng ca
cc ht ( c th l:
A. C gi tr bt k. B. 600 C. 1600 D. 1200
Cu 61: ta dng prtn c 2,0MeV vo Nhn 7Li ng yn th thu hai nhn X c
cng ng nng. Nng lng lin kt ca ht nhn X l 28,3MeV v ht khi ca ht 7Li
l 0,0421u. Cho 1u = 931,5MeV/c2; khi lng ht nhn tnh theo u xp x bng
s khi. Tc ca ht nhn X bng:A. 1,96m/s. B. 2,20m/s. C. 2,16.107m/s.
D. 1,93.107m/s.
Cu 62: Ngi ta dng prtn c ng nng 2,0MeV bn vo ht Nhn 7Li
ng yn th thu c hai ht
nhn X c cng ng nng. Bit nng lng lin kt ca ht nhn X l 28,3MeV v
ht khi ca ht 7Li
l 0,0421u. Cho 1u = 931,5MeV/c2; khi lng ht nhn tnh theo u xp x
bng s khi. Tc ca
ht nhn X bng
A. 1,96m/s. B. 2,20m/s. C. 2,16.107m/s. D. 1,93.107m/s.
Cu 63: Dng ht Prtn c ng nng = 5,45 MeV bn vo ht nhn Beri ng yn
to nn phn ng: + + . H li sinh ra bay theo phng vung gc vi phng
chuyn ng ca Prtn. Bit ng nng ca Hli l = 4MeV v khi lng cc ht tnh
theo n v u bng s khi ca chng. ng nng ht nhn Liti c gi tr:
A. 46,565 MeV ; B. 3,575 MeV
C. 46,565 eV ;
D. 3,575 eV.
Cu 64: (H SP HN ln 5): Ngi ta dng ht prtn bn vo ht nhn ng yn gay
ra phn ng : p + 2
Bit phn ng trn l phn ng to nng lng v hai ht to thnh c cng ng
nng. Ly khi lng cc ht nhn tnh theo n v u gn ng bng s khi ca chng.
Gc gia hng chuyn ng ca cc ht bay ra c th l:
A. c gi tr bt kB. bng 600
C. bng 1600
D. bng 1200Cu 65: : Mt phng php c tnh th tch mu ng vt c v l s
dng ng v phng x it c hiu (123I). ng v ny thng c tng hp, c thi gian
bn r l 13 gi. N phn r n 123TE, l dng gn nh n nh tuyt i. c lng th
tch mu, ngi ta tim 10 ml dung dch it vo mu tnh mch ca th. Hot tnh
ca dung dch lc tim l 2mSv (n v o phng x). Sau 13 gi k t lc tim, ngi
ta ly ra mu mu 10 ml, hot tnh o c l 0,0025 mSv. c tnh th tch mu ca
ng vt l
(A) 10.0 L
(B) 8.0 L
(C) 4.0 L
(D) 2.5 L
Cu 66: Mt con lc l xo t trn mt phng nm ngang gm l xo nh, cng ,
mt u c nh, u kia gn vi vt nh khi lng . Ban u gi vt ti v tr l xo b
nn 10 cm, t mt vt nh khc khi lng st vt ri th nh cho hai vt bt u
chuyn ng dc theo phng ca trc l xo. H s ma st trt gia cc vt vi mt
phng ngang Ly Thi gian t khi th n khi vt dng li l:
A. 2,16 s.B. 0,31 s.C. 2,21 s.D. 2,06 s.Cu 67: bnh nhn dc iu tr
= ng v phng x dng tia gamma dit t bo bnh. time chiu x ln u l t=10'.
c sau 5 tun th bnh nhn pi ti bnh vin khm li v tip tc tr x. bit ck
bn r ca cht png x l T=70 ngy v vn dng ngun phng x sdung trong ln u.
vy ln tr x th 2 pi tin hnh trong time bao lu bnh nhn dc tr xa vi
cng 1 lng tia gamma nh ln 1 ?( coi t 0,75
Cu 85: Ngi ta trn 2 ngun phng x vi nhau. Ngun phng x c hng s
phng x l , ngun phng x th 2 c hng s phng x l . Bit . S ht nhn ban u
ca ngun th nht gp 3 ln s ht nhn ban u ca ngun th 2. Hng s phng x ca
ngun hn hp lA.
B.
C.
D.
Cu 86: C 0,10mol plni 210Po c t trong mt bnh kn cha mt lng ln kh
nit. Chm ht , phng ra t ngun phng x plni, bn ph ht nhn nit gy ra
phn ng (1): 4 +14N ( 17O +1H Gi s, c hai ht phng ra th c mt ht gy
ra phn ng (1). Sau khong thi gian bng mt chu k bn r ca plni (138,4
ngy), th tch (ktc) ca lng kh hir c to ra nh phn ng (1) bngA. 0,28l.
B. 0,56 l. C. 1,12 l. D. 0,14 l.
_1398801163.unknown
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