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GCu s 1:0.2Hin nay urani t nhin cha hai ng v phng x235Uv238U, vi t l s ht235Uv s ht238Ul71000. Bit chu k bn r ca235Uv238Uln lt l7,00.108nm v4,50.109nm. Cch y bao nhiu nm, urani t nhin c t l s ht235Uv s ht238Ul3100?3,15t nm.
1,74t nm.
2,22t nm.
2,74t nm.
Cu s 2:Chiu mt tia sng n sc t khng kh (chit sut bng1) vo mt phng ca mt khi thy tinh vi gc ti60o. Nu tia phn x v tia khc x vung gc vi nhau th chit sut ca loi thy tinh ny bng3.
32.
2.
23.
Cu s 3:Cho hai dao ng iu ha cng phng c cc phng trnh ln lt lx1=4cos(t6)(cm) vx2=4cos(t2)(cm). Dao ng tng hp ca hai dao ng ny c bin l42cm
2cm
43cm
8cm
Cu s 4:Mt vt dao ng cng bc di tc dng ca mt ngoi lc bin thin iu ha vi tn sf. Chu k dao ng ca vt l
12f.
2f.
2f.
1f.
Cu s 5:nh sng c tn s ln nht trong s cc nh sng n sc: , lam, chm, tm l nh sngchm.
lam.
.
tm.
Cu s 6:Vt nh ca mt con lc l xo dao ng iu ha theo phng ngang, mc th nng ti v tr cn bng. Khi gia tc ca vt c ln bng mt na ln gia tc cc i th t s gia ng nng v th nng ca vt l12.
3
2
13.
Cu s 7:Mch dao ng in t LC l tng ang hot ng. in tch ca mt bn t inbin thin theo hm bc nht ca thi gian.
khng thay i theo thi gian.
bin thin theo hm bc hai ca thi gian.
bin thin iu ha theo thi gian.
Cu s 8:in nng c truyn t ni pht n mt khu dn c bng ng dy mt pha vi hiu sut truyn ti l 90\%. Coi hao ph in nng ch do ta nhit trn ng dy v khng vt qu 20\% . Nu cng sut s dng in ca khu dn c ny tng 20\% v gi nguyn in p ni pht th hiu sut truyn ti in nng trn chnh ng dy l89,2%.
92,8%.
87,7%.
85,8%.
Cu s 9:Thin th khng phi l hnh tinh trong h Mt Tri lMc tinh.
Mt Trng.
Kim tinh.
Tri t.
Cu s 10:t hiu in thu=U2sint(viUvkhng i) vo hai u mt on mch RLC khng phn nhnh, xc nh. Dng in chy trong mch cgi tr tc thi ph thuc vo thi gian theo quy lut ca hm s sin hoc cosin.
gi tr tc thi thay i cn chiu khng thay i theo thi gian.
chiu thay i nhng gi tr tc thi khng thay i theo thi gian.
cng hiu dng thay i theo thi gian.
Cu s 11:Mt mch dao ng in t l tng ang c dao ng in t t do. Bit in tch cc i trn mt bn t in l42Cv cng dng in cc i trong mch l0,52A. Thi gian ngn nht in tch trn mt bn t gim t gi tr cc i n na gi tr cc i l83s.
43s.
23s.
163s.
Cu s 12:t n pu=U0cos(100t6)(V) vo hai u on mch cR,L,Cmc ni tip th cng dng in qua mch li=I0cos(100t+6)(A). H s cng sut ca on mch bng0,50.
0,86.
1,00.
0,71.
Cu s 13:Con lc l xo gm vt nh khi lng100g gn vi mt l xo nh. Con lc dao ng iu ha theo phng ngang vi phng trnhx=10cos10t(cm). Mc th nng v tr cn bng. Ly2=10. C nng ca con lc bng1,00J.
0,10J.
0,50J.
0,05J.
Cu s 14:Pht biu no sau y sai?Trong chn khng, mi nh sng n sc c mt bc sng xc nh
Trong chn khng, bc sng ca nh sng nh hn bc sng ca nh sng tm.
Trong nh sng trng c v s nh sng n sc.
Trong chn khng, cc nh sng n sc khc nhau truyn vi cng tc .
Cu s 15:Trong gi hc thc hnh, hc sinh mc ni tip mt qut in xoay chiu vi in trRri mc hai u on mch ny vo in p xoay chiu c gi tr hiu dng380V. Bit qut in ny c cc gi tr nh mc:220V 88W v khi hot ng ng cng sut nh mc th lch pha gia in p hai u qut v cng dng in qua n l, vicos=0,8. qut in ny chy ng cng sut nh mc thRbng354.
361.
267.
180.
Cu s 16:Hin tng phn x ton phn c th xy ra khi nh sng truyn theo chiu tkhng kh vo nc .
khng kh vo thy tinh.
nc vo khng kh.
nc vo khng kh.
Cu s 17:Quang in tr c ch to tcht bn dn v c c im l dn in km khi khng b chiu sng v tr nn dn in tt khi c chiu sng thch hp.
cht bn dn v c c im l dn in tt khi khng b chiu sng v tr nn dn in km khi c chiu sng thch hp.
kim loi v c c im l in tr sut ca n gim khi c nh sng thch hp chiu vo.
kim loi v c c im l in tr sut ca n tng khi c nh sng thch hp chiu vo.
Cu s 18:Mt mch dao ng in t LC l tng gm cun cm thun c t cm5Hv t in c in dung5F. Trong mch c dao ng in t t do. Khang thi gian gia hai ln lin tip m in tch trn mt bn t in c ln cc i l:2,5.106s.
10.106s.
5.106s.
106s.
Cu s 19:TiaXc cng bn cht vitia+.
tia.
tia.
tia hng ngai .
Cu s 20:Biu thc tnh chu k dao ng iu ha ca con lc vt l lT=2Imgd; trong :Il momen qun tnh ca con lc i vi trc quay nm ngang c nh xuyn qua vt,mvgln lt l khi lng ca con lc v gia tc trng trng ti ni t con lc. i lngdtrong biu thc lchiu di ln nht ca vt dng lm con lc.
khi lng ring ca vt dng lm con lc.
khong cch t trng tm ca con lc n trc quay.
khong cch t trng tm ca con lc n ng thng ng qua trc quay.
Cu s 21:mt vt sng nh vung gc vi trc chnh ca thu knh, cch thu knh15cm. Thu knh cho mt nh o ln gp hai ln vt. Tiu c ca thu knh l30cm.
20cm.
30cm.
10cm.
Cu s 22:Ti mt ni xc nh, chu k dao ng iu ha ca con lc t l thun vicn bc hai chiu di con lc
chiu di con lc
cn bc hai gia tc trng trng
gia tc trng trng
Cu s 23:Mch dao ng in t gm cun cm thun c t cm1mH v t in c in dung4nF. Tn s dao ng ring ca mch l2,5.105Hz.
5.105Hz.
2,5.106Hz.
5.106Hz.
Cu s 24:Mt ngi mt khng c tt quan st mt vt qua mt knh hin vi quang hc trong trng thi mt khng iu tit. Mt ngi c im cc cn cch mt25cm. Th knh c tiu c4cm v vt cch vt knh1312cm . Khi bi gic ca knh hin vi bng75. Tiu c vt knhf1v di quang hcca knh hin vi ny lf1=1,2cm v=16cm.
f1=1cm v=12cm.
f1=0,5cm v=11cm.
f1=0,8cm v=14cm.
Cu s 25:Khi so snh ht nhn126Cv ht nhn146C, pht biu no sau y ng?in tch ca ht nhn126Cnh hn in tch ca ht nhn146C.
S nucln ca ht nhn126Cbng s nucln ca ht nhn146C.
S prtn ca ht nhn126Cln hn s prtn ca ht nhn146C.
S ntron ca ht nhn126Cnh hn s ntron ca ht nhn146C.
Cu s 26:Nguyn t hiro ang trng thi c bn c mc nng lng bng13,6eV. chuyn ln trng thi dng c mc nng lng3,4eV th nguyn t hiro phi hp th mt photon c nng lng17eV.
10,2eV.
4eV.
10,2eV.
Cu s 27:Mt vt nh dao ng iu ha dc theo trc Ox vi bin 5cm, chu k2s. Ti thi imt=0vt i qua v tr cn bng Ox theo chiu dng. Phng trnh dao ng ca vt lx=5cos(t2)(cm).
x=5cos(t+2)(cm).
x=5cos(2t+2)(cm).
x=5cos(2t2)(cm).
Cu s 28:Chiu mt chm tia sng n sc, song song, hp (coi nh mt tia sng) t khng kh vo thu tinh vi gc tii. Bit tia khc x trong thu tinh vung gc vi tia phn x ngoi khng kh, chit sut t i ca thu tinh i vi khng kh bng3. Gc tiic gi tr l750.
450.
300.
600.
Cu s 29:Khi chiu ln lt hai bc x c tn s lf1,f2(vif1