Song Co

 C©u 1 :  !"#$  %&'( π )'*)+ ,-.#/01.#23#/4 A. %5 ( λ B. %5 λ C. %'567*8) 9 λ D. %5 9 λ C©u 2 : :đúng0;!< A. =>43?@#/ "#AB"0 B. =>43?B" #/"#A0 C. CDE#A# =F0 D. &* C©u 3 : G=H""&*;487I"#$ %& 7 '977π)')0J:K#?&;*LM?N*O#/&; A"2K 4K 8 P80;HQ=R-7*ST*2Q U?#+NO0 A. 9 B. 8 C. ( D. V C©u 4 : Ađúng= AW:X A. Y4#$#AC4#$#AW  B. Z#C4#$#A*W >[\ !CDE#A0 C. Z#C4#$#A*W RR+=R-0 D. Z#C4#$#A*W >[\ !]$"CDE#A 0 C©u 5 : :đúng0^< A. ZQL4.:+0 B. ZQ=RL4.:+"0 C. ZQ!: + Q]M:# D. &*;*A0 C©u 6 : G?#/"#A\" V π \E%L 9 _L P  A. %5 λ 6 ` λ B. %5 λ a ` λ C. % λ 6 ` λ D. &b; C©u 7 : 4H/A*#/?3, !]c< A. %*T9*TVd B. %9*9T9*9TV*'000) C. e@ %9 D. e@ % C©u 8 : :"4]?đúng#4"4]?< A. ;!CDE#A #=F0 B. Q !R#E@.*]![ \. !Q0 C. O3?4Q/]! #/"#A$B " !0 D. &*;*A0 C©u 9 : :đúng.fA ! A. ZQ0 B. OW0 C. ZQ#A D. ;/0 C©u 10 : Z+?& ;#/b@g4P8"4=H"I "#$< P %&'(7π)h 9 %&'(7π6π)0ZQ#A#/b@g %(7'T)0J: i*j?#/+&;&i%ij%j;0Z$QU+#/+ij0 A. k B. ( C. 8 D. ` C©u 11 : Z#/b4@g=H"&*;"#$< & ;   9P7 ')= = π 0ZQ#AVT0#$+N4&*;=>  P %P8h 9 %97< A. k  9 V 'P7  )') ` π = π − B.  V*8 ( 9 '8 )') P9 P9 π = π − P C. k  9 'P7  )') P9 P9 π π = π − D. k  ( 'P7  )') P9 P9 π π = π + C©u 12 : GQ87Gl P87Gl05-"Q< A. 977Gl0 B. 87Gl0 C. P87Gl0 D. P77Gl0 C©u 13 : 5]/W@"R*W#AW]/0 A. J>PT( B. ZW( C. J>PT9 D. 5RZ- C©u 14 : NP*# !Q977Gl*Q.0Y4,#/E @`0ZQ#A#/< A. km*8T B. S7T0 C. ``*9T D. ``*kT0 C©u 15 : N>&;*;Q. & !"#$  (97 ')= π 0ZQ#A#/98T0A=\ AA&;?L>#\ ,=&*;A A.  9*8== B.  P*98== C. P  P*98'= ) 9 = + D. P  9*8'= ) 9 = + C©u 16 : :đúng0ZQ#A#R#E"n HQ< A. ;>@R#E B. ZQ C. ;!0 D. OW C©u 17 : Z#/o&*&Q. oA"#$ o  88 ')= π 0ZQ #A#/9(T0;!#/< A. P*8V B. m*` C. `7 D. 7*9( C©u 18 : Z#2\ A#/b!*=H"&*; !Q9SGl0Z+ ?N44&*;3=> P %9P* 9 %980]/U+0J3 N E##U&;]DU+=40ZQ#A#/b!< A. VkT B. 9ST C. 7*8kT D. PP9T C©u 19 : N$#nP*p"R?AqA=R=2#Q0b  !Q``7GlppQ*ZQ#A#=R=2VV7T0? p#Q$A=R=2?< A. 7*8 B. 7*k8 C. P9*80 D. 980 C©u 20 : NY !Qr%P77Gl*]H%P*9*0N? N#/4+V7R+@*]H3N s?3t +@0ZQ A. VST B. (`T C. (9T D. 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( B. V C. 8 D. 9 C©u 25 : Z#/]Ab@g"4o P  o 9 U\AsBQB]/  B"]]y=R0qLM4EpB"2 !E##U0OH Ec@C?N P \E P _ 9 %P*7k$EcPPC?N 9  P _ 9 % V*8k*EB+0;! A. 7*`8 B. 9*P( C. 9*8 D. 7*98 C©u 26 : Z#\#/b!*=H"& ;4P(*8B]/ *B"0J:K#?&;*?Ny#/K;#?K@4K7*8b !Rc/0Q? !]/U+##/+&K A. P8 B. P( C. k D. S C©u 27 : OE=>4\#/b!+=H"& ; !QP8Gl0OE@]/U+c@=?,E##U&;+3 ?N\=>4H& ;]y90ZQ#A#/b!0 A. (8T B. V7T C. P8T D. 9`T C©u 28 : G&*;49PI4"#$  P %'(πa ( π )')  9 %]'(π)')*#A#R#E !QP9'T)0Z$Q? U+#/+z&; A. S B. ` C. m D. k C©u 29 : Q(87Gl#A !QV`7T#=R=20J3?4P#/ "#A$< A. 1R"0 B. {\" ( π 0 C. O"0 D. B"0 C©u 30 : Z+?N4=>L"#$ π π λ = − 2 4 cos(200 ) M x u t cm 0ZQ  A. 7*7P B. P77Gl C. P77 D. 977Gl C©u 31 : N"#$ π = −8 cos 2 ( ) 0,1 50 t x u mm *#L')*')0=$ A. 87 B. 7*P C. S D. P C©u 32 : :đúng0fA ! A. b# v2cE0 B. ;! W0 C. ZQ ]/0 D. ZQ#A C©u 33 : 4]?đúng= A,X A. 5! ">L+#A IB"* ! +, B. O3? !]/U +0 C. ;n3?c/=R 0 D. 4]n4Q/]! 0 C©u 34 : eB/|@?$]/-"< P % 7 '=La})   9 % 7 '=La}6~) A. &%9 7 B. &%9 7 '~T9) C. &% 7 '~) D. &% 7 T9 C©u 35 : 4b2|< A. **E0 B. **f C. *f*E0 D. ZQ*ZQ*]/0 C©u 36 : :#A#R#E v@ A. 34"x v@U/=H B. 4"x v@p C. R !Qr !4 D. >&*;* V ?=Hv C©u 37 : Z#/o&*&Q. oA !Q97Gl$#/80NQ#/ #9]n$po"> !Q< A. (7Gl B. P7Gl C. 87Gl D. P9Gl C©u 38 : :đúng0Z#C4#$0J: ϕ ∆ \""0;/ -"+N#A+4#.U+=< A. 9n ϕ π ∆ = B. '9 P) 9 ∆ = + v n f ϕ C. '9 P) 9 n π ϕ ∆ = + D. '9 P)n ϕ π ∆ = + C©u 39 : 5•*p4 .#2=4#/B$ A. +#]/=4 B. +#=4 C. Z+#f=4 D. =HC>=4 C©u 40 : #$R>#AI#nou%7*7( π '(_7*8L)*# L2I')* I0ZQ#A A. (T B. 9T C. 8T D. ST C©u 41 : &#@ !"#$%(π')+#A !Q (7T0;H?N4&8*k*?ON@" !& A. O4&`*( B. O4&(*S C. O4&8*` D. 4"4=4 C©u 42 : OEMs4LQ4*+A#/b!+$#s0OH- W€P•*2E+4€s4#90 A. P7•T B. 7*7S•T C. 7*7S•T 9 D. 7*79•T 9 C©u 43 : :đúng0O=H"< A. B"*BQ*B"b\ "=R-IE B. BQ0 C. B"0 D. BQ*B" B]/0 C©u 44 : GEc4( Cy3:0;!!@, E?+/< A. P` B. ( C. S D. 9 C©u 45 : :đúng05>4\,#/&;%0&Q !* ;Q.$! ">L++; A. O"0 B. 1R"0 C. B"0 D. {\" ( π 0 C©u 46 : &#@W# !Qr%7*8Gl+#/ !]/V0 Z#E`#A`:I0uM?;#/4&V ?4& P9*#/+;s]/?" !& A. ` B. V C. ( D. 8 C©u 47 : #$#A#/<% 7 '=La})01€*QIE +?w< A. %a} 9  7 '=La}) B. %a} 9  7 '=La}) C. %} 9  7 '=La}) D. %} 9  7 '=La}) C©u 48 : Z#/b!: !"#$ P 8'P777 )' ) V u t cm π π = −   9 ( 8'P777 )' ) V u t cm π π = − 0;HQ#A]y97T0J:o#?=>43 0?Ny#=>#/EzQ4o+P9w A.  !]/P70 B.  !]/9*80 C. =R0 D.  !]/80 C©u 49 : Z#/b#@#* ]-Q*: !"#$ 8'( ) 9 u t π π = + 0N4 ( "-#/b!0OEH4b]y3!"4Abc7*8')05 EC4w@4"0 A. e+ .#2L4. !]/80 B. e !]/8+0 C. e !]/8H#L 0 D. c/0 C©u 50 : 5E+?WP77$cE+w A. ZW(';I) B. >9';I) C. ZW9';I) D. 4"4=4 C©u 51 : :đúng0J:=>43?#/"#A* Q#A*Z =F0OH  5 Z = '5%7*P*9*000)*$?< A. B"0 B. "0 C.  R"0 D. 5RL4.0 C©u 52 : Z#\#/b!*=H"& ;4P(*8B]/ B"0?Ny#/&;#?K@4K7*8b!Rc/Q?  !]/U+#=>,&HK A. S B. P( C. P8 D. k C©u 53 : Z+?&4O'?)=>O&%PcE+{ & %m7';)0;HE•K 7 %P7 aP7 •T 9 0E+& A. P•T 9 B. 7*P•T 9 C. P7•T 9 D. 4"4=4 C©u 54 : 4]? A. #A#:R#E> =R B. :#A#:R#E* =R#A#=R C. \L•# !: D. \,qL•##/ C©u 55 : :đúng0GB$< A. BQ0 B. BW0 C. B]/0 D. BQ B]/0 C©u 56 : \, :=4 A< A. , B. NR#,#A C. J D. Z2@">L+ C©u 57 : 5>43?@#/"#A\" ( π  A. 9 λ B. ( λ C. S λ D. ` λ C©u 58 : G?p43=>`*P7 `*V80ZQ`S7Gl*Q#A# =R=2V(7T0\"+?#/< A. π0 B. P`π C. ( π 0 D. ( π C©u 59 : Z+?&4o+%PcE{ & %m7;*]HE•< P9 7 P7 − = I •T 9 0E+&< A. S P7 = A I •T 9 B. 7P*7 = A I •T 9 C. 77P*7 = A I •T 9 D. ( P7 − = A I •T 9 C©u 60 : :đúng0ZU\2\#/b!<& ;=H""#$ +&*;< & % ; %ω$"]-"+N' !N&% P  N;% 9 )< A. P 9 ' )d d π λ + − B. P 9 − − d d f v π C. P 9 ' )+d d f v π D. P 9 ' )−d d π λ C©u 61 : G=H" P * 9 #\#/b4@g0OHWQ  P   9 /9$=>43?/H"#/ P  9 ]/ U?w-HX A. 5R-0 B. ZW/90 8 C. ZW/(0 D. J>90 C©u 62 : A=H" P   9 c Ab4k !]c λ %970Z#/+ P  9 ]/U+0;H#y="4#, P   9  A0 A. `U+ B. SU+ C. kU+ D. mU+ C©u 63 : o#@yA !]/V !Q9Gl09 #A90:QEoC .#2]yIA0{ ?N#/4o+9*8+E?9< A. L N %V0 B. L N %aV0 C. L N %P*80 D. L N %7 C©u 64 : N4M"g*Q.*s+=22 !=F=R-  ]y7*7S0^4M""4# A. /0 B. EI0 C. +0 D. + C©u 65 : "#$%&'7*( L6k 6 TV)#L') .#2?N#/"   #A*')0#$]?‚< A. N+IA !Q 7*9T B. N+IA#nL !Q Pk*8T C. N+IA !Q 7*P8T D. N+IA#nL !Q 7*P8T C©u 66 : :đúng0J:% 9 _ P =>43?#/"#A* Q#A *rQ0OH  '95 P) 9r = + h'5%7*P*9*000)*$?< A. "0 B.  R"0 C. 5RL4.0 D. B"0 C©u 67 : N:#A"#A !ZQ(7T0#$?o #/"#A< 9 '9 0 ) O u co t cm π = #$+?Ny#!o 4o P7< A. 9 '9 0 ) 9 M u co t cm π π = − B. 9 '9 0 ) ( M u co t cm π π = − C.  9 '9 0 ) 9 M co t cm π π = + D. 9 '9 0 ) ( M u co t cm π π = + C©u 68 : Q(77Gl#A#=R=2 ! vQV97T0\"3?4 7*9#/B"#A]/X A. 9πT8 B. πT9 C. πT( D. (πT8 C©u 69 : 5+n"4*. A. E$IE B. E0 C. E"c+"2=$ D. Ez C©u 70 : Ađúng= AUX A. A=\?4"> =H"ƒ">BQ*B" b\Q"=R-IE0 B. JU-"4=4 #=R0 C. Y„23?B" "I#]0 D. A=\?]/U+4 "">"0 C©u 71 : Z#\*=>43U?/H"y#/+Q (0ZQ#AP`7T0ZQ A. P7Gl B. (7Gl0 C. `7Gl0 D. 97Gl0 C©u 72 : NY !QP77Gl*0e%P*9*#/ Q,VSTH(`T0?#/,-.$Q A. VST B. (`T C. (9T D. (7T C©u 73 : N"#$ π = −5 cos ( ) 0,1 2 t x u mm *#L2]y*2]y01.#2 "xN4Q+VpE?%9 A. 8 B. 7 ` C. 8 D. 9*8 C©u 74 : G=H"&*;4P7"#$ & ;   897 ')= = π 0ZQ #A#/b@gPT0#$-"+?N#/b!+# ?&;< A.  P7'97  )')= π − π B.  P7'97  )')= π − π C.  P7'97  )')= π + π D.  8'97  )')= π + π C©u 75 : N:#A#/"#A0#$?N#/" #A< N %V π ')0#$?O#/"#A'NO% 98)< O %V' π 6 π T()')04]?X A. #A,NHO ! vQ9'T)0 B. A,NHO ! vQPTV'T)0 C. A,OHN ! vQV'T)0 D. A,OHN ! vQPTV'T) C©u 76 : N:#A:IEz"#$+o< 9 ' 0 ) o u A t cm T π = 0N?N4o]yPTV]!pE?%PT9=$. ? N %90;/&< A. 9 B. cmV9 C. ( V  D. ( C©u 77 : < A. 4"xR#EI " R !"#A0 B. #AI"zc0 C. #AI"0 D. 4"xR#E#B ! "#A0 C©u 78 : :"4]?đúng#4E"4]?!< A. =F"xR#E #AC:=F0 B. ZQ4"x v@: ZQ C. +.>Q:Q 0 D. OWRR=R-# C4#$#A C©u 79 : Z#2\ A#/b!<=H" P   9  R"4P7 * !]!λ%90Z$ .#2?U+ P @X A. P B. 7*8 C. 7 D. N=HC>=40 C©u 80 : :sai0=H""4#,4< A. BQ*B"#A0 B. BQ B"0 C. BQ B"b\" =R-IE D. BQ \"=R- IE0 C©u 81 : N]?.]p"#$<%9S'97La9777)')*Q A. 87T B. P77T C. VP(T D. VV(T C©u 82 : NE…4] Ef*p4P78`E=44" Ef$I @9H…4V0ZQ#A#=R=2VV7T$ZQ#A# Ef A. 8977T B. 8P77T C. 89S7T D. 8V77T C©u 83 : Z+?N ,#A!*"#$+N+<   P %'}a7*PL)  9 %'}a7*PLa 9 π )0;/-"+N A. &% 9 9 π  B. &%9 9 π C. &%9 ( π  D. &% ) ( P'9 π +  C©u 84 : G=H" A. BQ*\"=R- B. B"*BQ*\"=R - C. B"*BQ*B" D. B"*BQ C©u 85 : NQ#nAP0†Q"2RAqA=2#Q0b  !Q`77GlppQ0ZQ#=R=2VV7T0? k p#Q">Aq=2g@ A. 7*k8 B. P9*8 C. 98 D. 7*8 C©u 86 : Z#/b@gpo !QP7Gl*#A !Q %7*(T0Z#/"#A9? YIcUo**Y !Y%P80]/ %P =R-=#A0OH+E?P$ +YBE?@< A. 9 B. aP C. P D. 7 C©u 87 : Asai = AW:X A. OWRR=R-#C4 #$#A0 B. 5#A,?#/b "z*W>[\ !CD E#A0 C. Y4#$#AC4#$#AW 0 D. 5#A,?#=R *W>[\ !]$" CDE#A C©u 88 : N,#/+%9' ( π L)'97π6πT9)0Z#+E? "xN#/ .#2]y4Qo=>L')0ZQ A. ST B. ST C. 7*ST D. 4"4=4 C©u 89 : .B+4+n=4"4#w A. B]/ B. BQ*B]/ Q C. BQ*B]/=4 D. Q C©u 90 : G\,qL>#Q ! A.  B. : C. \, D. >&*;* C©u 91 : Z#/b@g+=H"&*; !=F7*790ZQ#A#/b@ gP8T0Z#+4N P 4&*;3=> P %P9h 9 %P(*(  N 9 4&*;3=> ‡ P  %P`*8h ‡ 9  %Pm*78< A. N P  N 9  !]/U+0 B. N P  !]/U+ N 9 c/ =R C. N P c/=R N 9  ! ]/U+0 D. N P  N 9 c/=R0 C©u 92 : ]n !"#$   %&'( π )'*)+,-.#/01.#23#/4 A. %5 ( λ B. %5 λ C. %5 9 λ D. %'567*8) 9 λ C©u 93 : NA{3Q.p0Gg"4#]!@]y ]/X A. ({ B. 9{ C. {T9 D. { C©u 94 : Asai= A,X A. 5>43b]n/H" ]y]!λ0 B. ,4]n 4Q. #=R0 C. 5>43b]n/H" ]y 9 λ D. Z#\,*!  ">L+>DA=\=H" / !0 C©u 95 : \,#A>#=R A. Y4#$#AC4#$#AW  B. \, C. eU4\, D. Y4#$#AC4#$#A" C©u 96 : G?#/"#A R"=\E]y A. 9 λ B. K λ S C. % ( λ D. '9 P) 9 K λ + C©u 97 : ,L>##/&;%PP !;U*&Q. ]!]y(0Z#/< A. 8]n*80 B. `]n*` C. `]n*80 D. 8]n*`0 C©u 98 : N&;%87#Ix&Q.*; !Q87Gl$#/P9] /05?O4&+97]nc@=?,& Q#A #/< A. c`* %(T0 B. ]nc8* %(T0 C. ]nc`* %(T0 D. c8* %(T0 C©u 99 : &Wzy#@Q !]>#Qr?- "#$L%& t ω '*)*]H#y9#AP7=R-0ZQ ]/??@#/"#A\"πT8P A. 8Gl B. P7Gl C. 7*8Gl D. PGl C©u 100 : Z+?&4O'?)=>O&%PcE+{ & %m7';)0;HE•K 7 %P7 aP7 •T 9 0R@"4 A. P98k• B. P98*k• C. P9*8k• D. P*98k• C©u 101 : NY !Qr%P77Gl*#/,-.*0 #/Q %(7T0N?N#/4+R+@* ]H3N s?3t+@0N4 A. 87 B. (7 C. 97 D. V7 C©u 102 : N>&;`(*;U & !Qr0ZQ#A#/ 98T0A=\ AQ?L>#\,#/< A. P r P*9S'= ) 9 = + B. r P 7*Vm'= ) 9 = + C. r 7*Vm== D. r P*9S== C©u 103 : NQ4].].]>Qr0=]g].*Q]>"4#w HX A. J>LQ9 B. ZW/@"9 C. ZW/@"( D. 1ˆ#! C©u 104 : N=#A#=R=2]!870ZQ#A#=R=2VV7T*# !P877T0Z2]!=#A#!0 A. PP B. 9*9kV C. 7*PP D. 99k*V C©u 105 : :đúng05>4\,#/&;%0&Q !* ;U$! ">L++; A. B"0 B. {\" ( π 0 C. 1R"0 D. O"0 C©u 106 : N"#$ π = −8 cos 2 ( ) 0,1 50 t x u mm *#L')*')0;! A. 7*P B. 7*8 C. S D. P C©u 107 : E+?#R#E#A 8 P7 − •T 9 0;HE• P9 7 P7 − = I •T 9 0NcE+?]y< A. S7; B. `7; C. k7; D. 87; C©u 108 : ]n !"#$   %&'( π )'*)+,-.#/01.#23]n#/4 A. %'567*8) 9 λ B. %5 λ C. %5 ( λ D. %5 9 λ C©u 109 : . m A. Z-".Q+ B. Z-".]> C. Z-".@>4+ D. Z-".+ C©u 110 : 9"4B]/*B" B=F*r%((7Gl*b4P0Gg E">cp#/EQ?=RI@0ZQ#=R=2]y V89T0 A. 7*V=?,]/">0 B. 7*V=?,P# C. 7*V=?,]/#40 D. O23*4€7*8 C©u 111 : NcEEKL4.]pRc< A. 7 )' I I dBL = B. 7 P7)' I I dBL = C. 7 ' ) P7L dB I I = D. I I dBL 7 )' = C©u 112 : Z+9?o P *o 9 4(S#/b@g9"4I"z c !"#$< P %8'P77 π )')h 9 %8'P77 π 6 π T9)')01vQ#A#/ b@g9T0]/=R-#C4#$#A0Q?#/+o P o 9   !]/U+'=R=?o P ho 9 ) A. 98 B. 9V C. 9` D. 9( C©u 113 : :đúng0Z#\*3?c/=R$< A. % P '5 ) 9 r + B. %5 λ C. ∆ = n ϕ λ D. '9 P) 9 ∆ = +n π ϕ C©u 114 : :đúng0Z#\ !"BQ*3? !]/!@$\E% 9 _ P  A. %5 λ B. %95 π C. ∆ = n ϕ λ D. '9 P)n ϕ π ∆ = + C©u 115 : NY !Q,m7GlHPP7Gl*0e%P*9* #/Q %(7T0?#/,-.$Q A. P77Gl B. m7Gl C. PP7Gl D. N4"4=4 C©u 116 : ,#/U@#AIA<  P % 7 '=La})  9 % 7 '=L6})0;?c]?.,#/ A. %9 7 '=L)0'}) B. %9 7 '=L)0'}) C. %9 7 '=La}) D. % 7 '=L)0'}) C©u 117 : :đúng0ZQ#A=R"n < A. ZQ ]/ B. ;/ C. ;/ ]>@R#E D. ZQ C©u 118 : Asai = AX A. #A#:R #E0 B. =R#A#=R0 C. Qy#=>,P`GlH 97777Gl0 D. Q#A"n\R #E#A0 C©u 119 :  !"#$  %&'( π )'*)+ ,-.#/01.#23]n#/4 A. %5 9 λ B. %5 ( λ C. %5 λ D. %'567*8) 9 λ C©u 120 : NY !Qr*0e%P*9*#/Q %(7T0N?N#/4+V7R+@*]H3N s ?3t+@0ZQ A. P77Gl B. m7Gl C. PP7Gl D. N4"4=4 C©u 121 : N#@& !QrI" R !0;/( Q#/(T0uM?N4&9S@R\" !&∆ϕ%'9=6 P)πT90;HQr#=>99_9`Gl*]! P7 [...]... dao ng ca súng l u = acost Phng trỡnh no sau õy ỳng vi phng trỡnh dao ng ca im M cỏch O mt khong OM = d B 2 fd 2 d uM = aM cos t ữ v C 2 fd uM = aM cos t + ữ v Câu 149 : A C Câu 150 : A C Câu 151 : A C Câu 152 : A C Câu 153 : A C Câu 154 : A C uM = aM cos t ữ v D 2 fd uM = aM cos t ữ v m s c la mụ t c tinh sinh li cua õm cho phep phõn biờ t c hai õm co cung biờn ụ c phat... cung biờn ụ c phat ra cung mụ t nha c cu B co cung ụ to phat ra bi hai nha c cu khac nhau ta i hai thi iờ m khac nhau co cung biờn ụ phat ra bi hai nha c cu khac nhau D co cung tõ n sụ cựng biờn phat ra bi hai nha c cu khac nhau Ti hai im A v B trờn mt cht lng cỏch nhau 15 cm cú hai ngun phỏt súng kt hp dao ng theo phng trỡnh: u1 = Acos(40t); u2 = Acos(40t + ) Tc truyn súng trờn mt cht lng v... cú 2 ngun phỏt súng dao ng theo phng thng ng vi phng trỡnh: u1 = 5cos( 100 t) (mm) ; u2 = 5cos(100 t + /2) (mm) Vn tc truyn súng trờn mt cht lng l 2 m/s Coi biờn súng khụng i trong quỏ trỡnh truyn súng S im trờn on O1O2 dao ng vi biờn cc i l 23 B 25 26 D 24 Hai ngun kt hp ng pha A, B cỏch nhau 50mm dao ng theo phng trỡnh u = A0cos(200t) (mm) Xột v mt phớa ng trung trc ca AB ta thy võn bc K i qua... dao ng x = Acos t (cm,s), bit rng sau 2s súng truyn c 10m khụng i Tn s dao ng l bao nhiờu hai im gn nhau nht trờn mt phng truyn súng lch pha nhau /2 l 1m Gỏi tr khỏc B 5Hz 1,25Hz D 1Hz Chn cõu ỳng Thc hin thớ nghim giao thoa trờn mt nc: A v B l hai ngun kt hp cú phng trỡnh súng ti A, B l: uA = uB = acost thỡ biờn súng tng hp ti M (vi MA = d1 v MB = d2) l: B (d d ) f (d + d ) f 2a cos 2 1 v d d... ng ca dõy l: 95Hz B 85Hz 80Hz D 90Hz Ti im A cỏch mt ngun õm N (coi l ngun im) mt khong NA = 1m cú mc cng õm ti ú l LA = 90(dB) Bit cng õm chun I0 = 10-10W/m2 Ti im B cỏch N l BN = 10m cú cng õm ti B l 1W/m2 B 0,1W/m2 11 C Câu 134 : 0,010W/m2 D mt ỏp ỏn khỏc Trờn mt nc cú hai ngun súng c hc dao ng vi phng trỡnh u1 = 5cos(1000 t u2 = 5cos(1000 t )(cm) v 3 4 )(cm) Bit tc truyn súng bng 20m/s Gi... Acos(10t + /2) (m,s) Khong cỏch gia hai im gn nhau nht trờn mt phng truyn súng m ti ú cỏc phn t dao ng lch pha nhau /3 l 5m Tc súng l 3m/s B 3,33m/s 5m/s D 15m/s Trờn si dõy OA, u A c nh v u O dao ng iu ho cú phng trỡnh u O = 5sin 5t(cm) Tc truyn súng trờn dõy l 24cm/s v gi s trong quỏ trỡnh truyn súng biờn súng khụng i Phng trỡnh súng ti im M cỏch O on 2,4cm l: B u M = 5cos(5t + )(cm) uM = 5cos(5t... nc: A v B l hai ngun kt hp cú phng trỡnh súng ti A, B l: uA = uB = acost thỡ biờn súng tng hp ti M (vi MA = d1 v MB = d2) l: B (d d ) f (d + d ) f 2a cos 2 1 v d d 2a sin 1 2 ữ D 2acos 1 2 ữ v d d 2acos 2 1 ữ Chn cõu ỳng m sc l c tớnh sinh lý ca õm cú liờn quan mt thit vi th dao ng õm B Tn s Biờn D Nng lng õm Hai ngun kt hp ng pha trờn mt nc cỏch nhau 40cm Trờn ng ni hai ngun, ngi... phng trỡnh súng ti A, B l: uA = uB = acost thỡ qu tớch nhng im ng yờn khụng dao ng l: h cỏc ng hyperbol nhn A, B lm tiờu im B h cỏc ng hyperbol nhn A, B lm tiờu im v bao gm c ng trung trc ca AB ng trung trc ca AB D h cỏc ng hyperbol cú tiờu im AB Chn cõu ỳng Thc hin thớ nghim giao thoa trờn mt nc: A v B l hai ngun kt hp cú phng trỡnh súng ti A, B l: uA = uB = acost thỡ qu tớch nhng im dao ng vi biờn... truyn i theo phng thng ng D cú cỏc phn t ca mụi trng dao ng vuụng gúc vi phng truyn súng Ti hai im A v B trờn mt cht lng cỏch nhau 15 cm cú hai ngun phỏt súng kt hp dao ng theo phng trỡnh: u1 = Acos(40t); u2 = Acos(40t + ) Tc truyn súng trờn mt cht lng v = 40 (cm/s) Gi E, F l hai im trờn on AB sao cho AE = EF = FB Tỡm s iờ m m t chõ t long ng yờn trờn on EF 7 B 4 6 D 5 Hai im M, N gn nhau nht trờn mt... ngun õm N (coi l ngun im) mt khong NA = 1m cú mc cng õm ti ú l LA = 90(dB) Bit cng õm chun I0 = 10-10W/m2 Ti im B cỏch N l BN = 10m cú mc cng õm ti B l 60(dB) B 90(dB) 70(dB) D 80(dB) Trờn b mt cht lng cú hai nghun phỏt súng c O1 v O2 thc hin dao ng iu hũa cựng tn s cựng biờn v cựng pha ban u bng khụng Ch xột cỏc ng m ti ú mt cht lng khụng dao ng v cựng mt phớa so vi ng trung trc Nu coi ng th nht . O u co t cm π = #$+?Ny#!o 4o P7< A. 9 '9 0 ) 9 M u co t cm π π = − B. 9 '9 0 ) ( M u co. π λ = − 2 4 cos(200 ) M x u t cm 0ZQ  A. 7*7P B. P77Gl C. P77 D. 977Gl C©u 31 : N"#$ π = −8 cos 2 ( ) 0,1