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Câu 1:  !"#$%&" '&"()"*+, /0+"#&"*1*23456 1*2&"(37 8/45 B. πfa 9/: ;/.5 Câu 2: <1= >?1@1*!*AB C: 4u cos ft π = D""E/FG  !1= H"-/IJ&"(1= )@ 4K"&" 1*LA@ ( ) 4 C 4 k π ϕ = +V /M')N%4.OP'4QOP/M27 A. 16cm M/4:" 9/.4" ;/K" Câu 3: (>R@1*C:OP1* !G:H"-A@ / 0A 4&"STU*VWSTXCY"/9*XC"   !/('+#&"*SC"B+T7 A. 0cm M/4" 9/C" ;/ZC" Câu 4: SB+"&"A !*R7 ( ) Q 4u cos t x π π = − /F*6* "&"."[BC-K\+&"7 8/CQ" M/ZCQ" C. 5,79cm ;/ZY,]" Câu 5: C::OP !"<1= 3"GQ:"-/( &"1= ):CY" !U*!%'(/9^_&1`*)&" !1/0+"#&"*=" &a/0+ #&"(b! &V7 8/="ca M/="c C. dương; đi xuống ;/1 Câu671= >?181*U*A<1= /0 ! 1= H"-/IJ"&"1= )8"*+H:"#? 1*LA *8"deXDf:YE5 /0g')N**h%KOP 'C.OP7 8/KYOP M/C:OP 9/C4OP D. 12,5Hz Câu 7: 0"<1= 1+" !U*A@aAB ( ) 4 C:u cos t x π π = − D"ED*g3cag3"E/(&"3"iAg*@) Y"/0+i"#&"AjkNg=3U*!1BAj(7 8/kF09M!1 B. qua VTCB, chiều âm 9/R1 ;/R=" tandanfotech@gmail.com PHƯƠNG TRÌNH SÓNG Câu 8: 0"l"?m+@">1*X.:OP/FG ! ")N***hCQ"-nn4]"-/M'+&")@"*hC:"+ 1*<A1*+@/o)N2G7 A. 2cm M/." 9/4H" ;/CQ" Câu 9: 1= >?181*U*A<1=   !1= HHK"-/IJ"&"1= )8"*h4K"? 1* LA8" ( ) 4 C 4 k π + /0B"')N**h%44OP'4KOPp 8/44OP M/4HOP 9/4QOP D. 28Hz Câu 10: 1*8X."/M' !341* W+2Aj"#/q*h)r4&"?i"A ! 1*<A7 8/ . π " M/ Q 4 π " C. Q π cm ;/ . 4 π " Câu 11: ="KY:OP !*""#g>/O&"8Mi "A !="1*<A):,Y"/M'r8Ms"&"1* iA8 !="*"#7 A. 425m/s M/YC:"- 9/.H:"- ;/QK:"- Câu 12: ^< !U*A@aGX4:"-/ohj !  /0+@AB7 XH H Z 4 o u cos t π π    ÷   D""E*3/0+#&" C + &"@ .u mm = h"/t6R&")@"*+H:"b7 8/H""[ M/.""h" 9/ . ""[ D. . mm và đang giảm Câu 13: 0+@"l?m#= 1*X4OP4" ! "l?mQ:"-/ohj+r&")@"*+aBh" 4Y x /M&V +)@"*+4Y"7 8/ Y 4* H . u t cm π π   = −  ÷   B. Y :CQ* H . u t cm π π   = −  ÷   tandanfotech@gmail.com C. Y :CQ* H Q u t cm π π   = −  ÷   ;/ Y 4* H Q u t cm π π   = −  ÷   Câu 14: 1* !*"#_%&"'&"()"*+, D"E/ u !8/M'AB+1+  X.*45D  g3" g3= E/F*#&" C 1*2AjQ5D"-EB1*2Aj( 7 A. 3π cm/s M/:Y5"- 9/H5"- ;/Q5"- Câu 15: B !U*A@a%>@4:OP !3" **h%:,"-'C"-/o^8M&"3"@aRi"Ag*@) C:"/OAj"#+8M1*<A/0 !7 8/C::"- M/KY"- 9/]:"- D. 80cm/s Câu 16:  !U*!%'(3""# !/O&"3") H/(GN*= 6p A. Khi M có vận tốc cực đại dương thì N ở li độ cực đại dương M/qRW+1B(GW+1 9/t1*2(3! ;/q'[W+B([W& Câu 17: 8M&"i"A !2"l)"A /0+"#&"*"l*)R8M*Ng=3< C X.""  4 XH"""l*)R8sRMa* ! !27 8/XY"" !%8'M B. a = 5 mm, truyền từ B đến A 9/X,"" !%8'M ;/X,"" !%M'M Câu 18: u4:OP !"l*)3"2"?m4"-= ) 1*U*A$V2)Aj?m/O&"("l*)?m iA !)44Y"/M'&"3">/0+#&"&"(+ a?A?/Om#v?*B&"b+a?A?p 8/ , CQ: s  M/ C K: s  9/ C CQ: s  D. . K: s Câu 19: >@A)1*U*AB 4 4:  . o u cos t π π    ÷  +  = D*g3 N""g3NE/IJ !U*"#$%@'&" tandanfotech@gmail.com C"-/0**h%@'*&"1*iA1*+>@pM') @"*hHY"/ A. 4 M/. 9/4 ;/Y Câu 20: <1= >[1%N/q*h#r'A <1= 1w$:C !1= ."-/q*h)r&"? <1= 1*iA1*3"j2_7 A. 20cm M/.:" 9/C:" ;/K" Câu 21: O&"(i3""A !)aX 8B0/ 0+#&" C X:  Xf." ( Xx."/y#&" 4 !  Xf8' !%( '/M8#&" 4 7 8/ . 4  CC C4 T  M/ 4 .  44 C4 T 9/ . 4  44 C4 T D. 4 . và CC C4 T Câu 22: uV?3.H2VsB2Vm 3"jB2V?/qG !2V?*V m *7 8/.H M/mC, C. lớn hơn 1,7 lần ;/m.H Câu 23: ^< !U*A@aGX4:"-/ohj !  /0+>@1*AB7 * X4*H5D""E/0**3= /0+ #&" C +&"@  .u = ""h"/t6R&")@"*+1XH:"R# &"D C f:4YEb7 8/C"" M/xC"" 9/ . "" D. .− mm Câu 24: 0+@">A)X4:OP !CQ"-/M&"$ 8M93"iA !iAg*@/M'@8X]"c@MX4HY"c @9XH4Y"/u&"1*iA8*+M97 8/C M/4 C. 3 ;/H Câu 25: ^ !"A !GXY:"-/SB 2"&"@A !7 4 o u acos t T π =    ÷   D"E/&")@*h BR #&"XC-QB1N &  X4"/M7 tandanfotech@gmail.com A. 4cm M/ H . " 9/4" ;/ 4 . " Câu 26:  !%@U*!1@a3""lG ! XC::"-/9z1*2>0XC/IJ&"8M!1@a) :,Y"M^/0+"#&"*&"81DAg@aE & B&"M7 8/=" M/="a C. li độ dương và đi xuống ;/1 Câu 27: >@1*XY:OP+*"l."D*  !E/M'*h)r,<>'A]"/{&"3""l) >@*+3Y"/9^X:6Aj+@kNg=3U*!1/0+# &" C 1*+34"h"/t1*+*#&" 4 XD C f4::YE3 *p 8/Z4" B. Y − cm 9/4" ;/ Y " tandanfotech@gmail.com . − D"ED*g3cag3"E/(&"3"iAg*@) Y"/0+i"#&"AjkNg=3U*!1BAj(7 8/kF09M!1 B. qua VTCB, chiều âm 9/R1 ;/R=" tandanfotech@gmail.com PHƯƠNG TRÌNH SÓNG Câu 8: 0"l"?m+@">1*X.:OP/FG

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