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GIAI CHI TIET DE DH LY- 2013

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BAÌ GIẢI CHI TIẾT MỘT SỐ CÂU ÐỀ THI TUYỂN SINH ĐẠI HỌC KHỐI A, A1 NĂM 2013 Môn thi : VẬT LÝ – Mã đề : 426    !"#$%&'( ) $ **+$,-. $ / 012$+3+4501   I. PHẦN CHUNG CHO TẤT CẢ THÍ SINH (40 câu, từ câu 1 đến câu 40) Câu 1: 67"*8  % 9 $ = ω :;<:=!  9 => ω -.?<=>2@%A0A$B0$% C,&-.%@ $D00E$8=!F"$G"C%:2&?4H$<I   J$45 CK"+0A$!0 82L%>  ϕ :    π < ϕ < <=>"*8"%CF2@%$% C,&>;I   J$45 CK" +0A$+M82L%>    π ϕ = −ϕ =>"*8"%CF2@%$% C,&>;N*+O$P29  gần giá trị nào nhất2%,&Q R); ST; ; U; ND 9 C :;< 9 C :;<V   d d U U VW  W  VX  X  X   )X   Y  Z:X [ \X  <  )Y  Z):X [   C Z <  V:Y  ZX [  <X [ X  VY  ZX [    CL ZZ   d d Z U   Z U V99 C    d Z Z 9 C        L CLCL ZR ZZZZR + −++ 9 C   Q  − Z Z C  :]< 2ϕ   R ZZ CL  − 2ϕ   R ZZ CL  −  R Z Z C L   −    π ϕ ϕ = − Vϕ  Zϕ    π V2ϕ  2ϕ  :=Jϕ  ^< R ZZ CL  − R Z Z C L   − V:X [ \X  <:X [   C Z <Y  V Y  ZX [  \X [  C Z Z   C Z V  CL ZZ \X [  C Z Z   C Z V   C Z    CL ZZ  V  C Z    L Z VX  X [ :]]<V99 C   Q  − Z Z C  9 C  Do đó U 0 = U  = 2U d1 = 90V. Câu 2:_+0 #"0`,=a22**4!$G**LE$>0-D$*$ b22-(c8>00ID$*$d078e$f22-(0>g%2*>0ID=,g%2* 4H$+'0>$G*+O R00 S00 )00 U00 Uh D i a λ =  −  000 Câu 3:_+#"0`,=a22**%2&**LE$0>%20**LE$ 0>%=>=>b%&'$*$a%-"-*$J+'0>g%2* R-D=,-.2&? S-D=,' =O+#=,+%,02&? U-D=,D0i% λ => Vλ 20 ⇒ => V 20 Câu 4:jG"d$G@klm+%&a+$,-.=!4!$G> R0 S0 0 U0 c f λ = 0 Câu 5:67"*8%   $ nπ :;<:n2&?4H$<=>2@%A0A$0E$8B0$% $D0 %@$G o$D0["+pY=>F"$G"CF=!Y  ^[Inn  J"*8"%CFb22 @%F"A$o$AInn    n  J"*8"%CFb22@%"+pA$o$AInn  J" *8"%CFb22@%$% $D0A$o$A9 [02i N*+O$P29 [02i gần giá trị nào nhất2%,&Q RT; ST; ; U/; ND*8CF_  9 9   [    [kRq =         +         ω ω 2&     02i  =+ L C L f f U U ;!n  n  n    'n  n  2&n [ n  dG#$-g9 [02i /; Câu 6 :k =rsC2 a%K2C3$(+F$ti=!' $0$%-J_A5h0=rg%2 $,t($a%C4L4L+JC2 $P2=r> R i $:  <  π = π − :$0< S i $:  <  π = π − :$0<  i $:  <  π = π + :$0< U i $:  <  π = π + :$0< Câu 7:u2$o$$P20 0*&8*"i2&$a%0 82=>2@%A0A$RS0E$8B0" +p) Ω $% $D0%@$G o$D0[=>F"$G"C%T/ vµ Ssg%2"+p%@$P2$*$$%  C,&$P20*&8*S+.0*&8*$G2$78$o$I+.g%2&a%=!$    = =K18w7$   /= =K18wJ$.%x'%F$P2A0A$RS>42%6 o$D0[$G*+Ogần giá trị nào nhất2%,&Q R/l STl l Ul ND =→ −+ = −+ →= L C LR C LR ZZ                     <   :<  : ω ω ω ω ω ωξ ξ Câu 8 :k =rsC2 a%K2(0 g%yAeC>$0U2 >&$G' > R$0 S$0 $0 U$0 ND A=12/2=6cm Câu 9:k A$G-4Hz0  _(%&4L-4H :-4H4L#<$P2A >&-$%&h =!$ $:$>$ **+$,-.<> R0   S0  T0  U0  Giải         1   m m m m v c = = = − − Câu 10:k $E$KiB0=rs$G-4H=>Ki$G $fu104H$7+'078e 2-.02*;rs20&'p=O+#$,A*$CFo$vu'=rs:J={< $$E$C2 a%K25h0   π = Jd*$CFo$vU2 a%K2$P2$E$2% --.$Ko$v*$CF$G *+O' gần giá trị nào nhất 2%,&Q R)$0 S$0 $0 UT$0 Giải: Z[w$@%=r2p;_SJ$Gv*$CF=J=r&;_S{0!>t|$*$;_S$}> m K F = = 5cm mà lúc đó v = 0 nên A= OO’ = 5cm. Chu kỳ dao động T = s1 π t t|  + Sau khi vật đi được      TT T T ++== π vật có toạ độ x =    = A cm và v = v max /2 + thôi tác dụng lực F thì VTCB lại ở O vì vậy nên toạ độ so với gốc O là x = A A +   biên độ mới là A’: A’ = =++   02i  <1: <1:: ω v AA 9.659cm Câu 11:67"*8   $u t π = :;<=>2@%A0A$0E$8B0"+p R = Ω F "$G    C π − = v=>$% $D0%@$G  L π = lSh%f$$45 CK"+A0A$> R   $   i t π π   = +  ÷   :R< S $   i t π π   = −  ÷   :R<  $   i t π π   = +  ÷   :R< U   $   i t π π   = −  ÷   :R< Câu 12:ND~0 ="C•++%&a.2f&'=!07xp0  $2i*$O+07 8eq#$6A_+*6x45e="=!,0_+*6xg%2- _+*6x40 g%D $@%*-#>T-0-4H>  -=>$%-Jg%2&g%2+F$$P2G>5x8C€N T  u0  1-  jG$o$E:nVklm<8*d="+%&ae$*$h00+'q#$6A_+* 6x+-D- >'%C4!,&Q R_d- T)  |6- T)  |_ S_d- /  |_- /  |6 _d- /  |6- /  |_ D. Từ kinh độ 81 0 20’T đến kinh độ 81 0 20’Đ. ND _$ ="$%=g%yA:g%•45<$2$$%-J_:_>52=K< =π:YZ<1_ hd ht F F= ⇒       : < : < : < GM m mv m R h R h R h T π + = = + + ⇒:YZ<      GM T π /T0 ⇒T/T0 ;J="8*G$o$E'G+%&ae07x>J$s0$@%!Ap$%sku+' J={ N3;>=O+#="6h0ku>- $G*+OG$α $  OM R OV R h α = = = + ⇒α/  /  ‚  Câu 13:k %B8*GC2 a%K2A+2G+KB,0t+%&a+'074!$=!4!$Gλ l2h0k=>u% $074!$0+'284L+%&aG0>$*$8@~4!$2C2 Stk /λtuλ=>tk=%.G$=!tu_+'Akuh00>8@~4!$C2 4H$82=!C2  $P2%Bt> R S  UT ND bh04H$82=!t$*$t0 AC:-Z<λ=!tk/λ≤C≤tuλ⇒$Gh0#$H8=L -ƒ/)„ Câu 14:N3kuW>$*$h0+'0 Kic4H$+(efph0t$OIKi$G$a%C> o'JtkkuuW$0NE=rs=>@%C4!W$P2Ki=>-#$#$h=rC2 a%K2 (84Lef_+g%*+JC2 z !o$-…!x=> !o$-…sx*$CF 'tKi•a%-D$*$!xb22h0k=>u>$0[x&π  ;rC2 =! @> R)lm Slm Tlm Ulm R R h+ O M V α N ND Zku 02i $0'$a%C>!x$P2Ki> [ 02i $0  ZRZ cmlAl   =∆+→∆ :< Z_(>v 02i v 0 'CMC>$G Al   =∆ :< _dCMC>#o$nlm Câu 15:lA,$G F-$>!J$G R4H'-$>s S4H'-$>! 4H'-+'$>! U4H'-+'$>s Câu 16:IG=a8..8*h%>C4!,&wQ Ru4H$P28..$>!-4!$G**f=!8..G$>! S..$GhBA++A*f&' ;!0†**LE$$G@ni*$O$*$8..a%024H42% Uu4H$P28..**#0sL4H$P28..**s Câu 17:_+'0 HC,&>BC>02@%$O2$GGCd=!wG:-h$D2@%C,&< S4!$G$P2G+%&a+',&> R0 S0 0 U0 ND wG⇒-λl1-10 Câu 18:67"*8%   $ t π :;<=>2@%A0A$0E$8B0"+pΩ$% $D0 %@$G o$D0 / π l=>F"$G"C%    π − vI"*8f$5b22@%"+p   ; J"*8f$5b22@%$% $D0$G !> R; S;    ; U   ; Câu 19:l20A$C2 "d#4p2$GC2 "doC6"#$$P2F"+0A$C2  fx=>f2@4H>g  =>g  =!   T    q q − + = g#‡5h0"#$$P2F "=>$45 CK"+0A$C2 fx@4H> ) =>0R$45 CK"+ 0A$C2 f2$G ! R0R S0R /0R U0R ND g   ) =>  0R=>   T    q q − + = :< _g   ) =>:<   T    q q − + = :<⇒g   )    T    q q − + = x&A>0=(52⇒     /  q i q i+ = :< g   ) =>  0R=>g   ) =>:<     /  q i q i+ = ⇒  /0R Câu 20:k K8Df8,A$$G$.%xkˆ+> 4H0>K8Df>& +2a%Co8,A$$P2  9=>B=O>&$zO'%2pg%*+J8,A$0†0$G>& 0†8,A$+2k(;R=.2+.u R   0  I4H  90>K8Df'%F+ 0> R- S /- U/ ND ˆ1uˆ  1=!ˆ  k(;−  :< ⇒u1:ˆ  <⇒0kuk1u R k1:ˆ  u R </20/- Câu 21:_+0 #"0=a22G4!$2%BG-H8t  =>t  C2 $•82$• ' 3"32 =%.G$ti&:% $074!$<=!$32 >=O+#7%Bt  $K%Bt  0 +'+F$t&l2h0=>‰0+'ti$Gt$0=>t‰/$0UO$$%&h%Bt  +'+F$t&=O +#2$G$ ·  PO Q $G*+O!xJ8@~4!$A-.C2 $K8@~4!$A‰C2  =!' $o$ASb2=>‰-.$K$o$A>-*$_+'Ath0@x0>$*$8@~ 4!$C2 =!' $o$A$*$0 A> R$0 S$0 $0 U$0 Câu 22: U•0 A α $G TTk(;E=>A,    T N  2f&',&+28Df   T T  / N p O α + → + lA8+..2&+2(84L=%.G$=!84L2&!$P2Aα-4H$*$ A,0 α %0  T%0 u )))%0 tT ))T%S%)k(;1$  6 $P2 A, T / O > RTk(; Sk(; k(; Uk(; ND 6O%rD> 4H p O p p p α = + r r r =J p p p α ⊥ r r '    O p p p p α = + ⇒0 t I t 0 α I α Z0 8 I 8 :< 6O%rD>4H : <) N p O p O K m m m m K K α α + + − − = + :< GI α TTk(;D":<=>:<J04H$I 8 Tk(;=>I t Tk(; Câu 23:N!Ag%2"$P20 -0A>Tµ0.*'($++2-s-0A>& R )  S )     U   ND hc A λ =  )  Câu 24:67"*8%9  $ω:9  =>ω-.?<=>2@%A0A$0E$8B0"+pYF" $G"C%$% $D0%@$G o$D0[2&?4H$I[[  =>[[  "*8"%CFp2@% $% $D0$G$•*+O "$82$P2"*8p2@%A0A$=!$45 CK"@4H> +2C=>+2CI[[  "*8"%CFb22@%$% $D0A$o$A "$82$P2"*8p2@% A0A$=!$45 CK">ϕN*+O$P2ϕgần giá trị nào nhất 2%,&Q RT+2C S/+2C +2C U+2C Câu 25:_2>2%,&không8D>28GiAQ R_2γ S_2β Z  _2α U_2q Câu 26: *$ 0f$  4H $P2$*$+A * Cd $P2%&'~ +.4H$ i*$O h% f$   n E n = − :(;<:Š<u%%&'~+.x8F0 8..$G4H(;J4!$G sx$P2f$iA0>%&'~+.G$Gh8*+2> R / 0 S / 0 /T / 0 U)T / 0 Câu 27:k GJ2+%&a+'0 HC,&($a% C4L$P2+F$tilJ={0.DJCA$P2HC,&A5h0   :45…f<=>    Z:<:45a…< _A5h0  =r$$P2h0u+',&> R$01 S$01 )$01 U)$01 Giải: + Từ hình vẽ dễ dàng thấy: cm= λ Tốc độ truyền sóng: v= 15/0,3 = 50cm/s Chu kỳ sóng: T= 40/50 = 0,8s + N đang ở VTCB và dao động đi lên vì vậy: V N = v max = A ω = 39,26cm/s Câu 28:67=>2@%$% L$x8$P20*&*8k  0 "*8i2&$a%$G*+O"%CF;I 2@%$% L$x8$P20*&*8k  =>2@%$% f$x8$P2k  J"*8"%CFp2@%$% f $x8$P2k  hp;I2@%$% f$x8$P2k  =!2@%$% f$x8$P2k  J"*8"% CFp2@%$% L$x8$P2k  hp;Ssg%20328#k  $Gzb2=KC,&$% L$x8 =>=KC,&$% f$x8 R S / U Câu 29:k -%C,&C€8eCcJ$br$GC"#$$0  g%2&a%g%20 +F$if:% $ 078e$P2-%<+d+45a%$G=($L$D0fd=%.G$=!+F$g%2&=>$G !__d .$o$Ag%2-%C,&> R  ˆ S  ˆ /  ˆ U  ˆ ND BS Φ =  −    ˆ Câu 30:6"4H$+%&adL8*0 -%C,$445C,&0 82=!"%%x+%&aD> )‹28#"$zCs2"+'45C,&=>-.=4Hg%*‹u%$.%x~CF" $P2-%C,$4>&‹=>b%&'"*8pL8*J"%%x+%&aD"+'$#45 C,&G> R//‹ S/TT‹ /)‹ U)/‹ Câu 31:S*-#S>+    0S*-#g%yACdk+%&'~+. R//  0 S  0   0 UTT  0 ND k$G+  +  )  0TT  0 Câu 32:l2$E$L$G$a%C>@4H>/$0=>$04H$+(p+@0 $8KI$*$=rs $P22$E$2p=O+#$,B5+%&a$$w$*$=r$$•4!2$2$E$C2  a%K2=!$•' G$+2078e=!2%N3∆>-D52Ex -hdw$+%&a=r$w$2C,&+(2%N*+O∆gần giá trị nào nhất 2%,&Q R/ S T U ND ZUA>&x>;_C2 i  i   q  R$: < ) ππ +t q  R$: < / ππ +t Zl2C,&2%-i  i  DJ$G 0  Câu 33:k =rsC2 a%K2(84L+JiR$π:#<_#d-D5 2Exh2$$P2=r$G !0 ~2 !2$$o$A> R/ S  UT ND _111/ Câu 34:l2C2 a%K2$•84L$•@$G' @4H>R  /$0R  $0=>"$82 2%  π U2 ?H8$P22C2 >&$G'  RT$0 S$0 T$0 U$0 ND     A A A= + T$0 Câu 35: N3 ε 6 >4H$P28..**s [ ε >4H$P28..**F$ ; ε >4H $P28..**=>jE8i8>2%,&wQ R ε 6 V ; ε V [ ε S [ ε V ε 6 V ; ε  ; ε V [ ε V ε 6 U [ ε V ; ε V ε 6  Câu 36: l"2&%+2o'$f22B=O8GiA  9 => / 9 =!Œ"A  9 =>A / 9 > T  S$%-J*+•$P2  9 => / 9 @4H>T / 0=> ) 0*$,&2'%0 %+2o'$GŒ"A  9 =>A / 9 >   Q RTz0 Sz0 Tz0 Uz0 Câu 37: _+'0 45e$O+0.+45e4!-.x8F=>8DiA,00 0*&%p $*$%B,00 -DC%4H$,0$G0f$$45 ,0>[-CO$$%&h0*&%+2i2%B,0'0 )0J0f$$45 ,0%4H$>[\:CS<ID$*$C> R/0 S0 )0 U0 Câu 38: _+$,-.**$G4!$G!x+$*$**LE$s=>20#0> R**#0 S**s **=> U**20 Câu 39: 6A0A$8B0 $% $D0%@A0A$q=>F":J={< I7=>2@%RS"*8 RS  % 9 $:  <= ω + ϕ :;<  :9    ω  =>  ϕ -.  ?< J  [ ω =  Ru 9  ;= => kS 9  ;= B5 Ru % !082  π =! kS % N*+O$P29  > R  ; S  T;   ; U  T; ND Z=J  [ ω = '9 [ 9  =r&% RS % q Z_2$G% Ru Z% kS % [ Z% q Z% q Z%  % q % RS ABMBAN UUU =+→  _dDBCMC>J04H$9 RS   ; Câu 40: k =rs-4HC2 a%K2=!$%-J=>$L>/:0$A=O +#$,<x&  π = _A    $0z =>> R S  U   T π ω π = =       m A W A m cm ω = ⇒ = =     d t t t W W W A x W W x − − = =  Câu 41 : IG=ag%28?=A$8*iA8*h%>2%,&> saiQ R‰%28?=A$8*iA$P20 %&'>0 "b=A$*+'•$*$2%p b-D S‰%28?=A$8*iAC$x+E7$$xs8*+2-O%G _+g%28?=A$8*iA$P2%&'~+.p=•**Jx&$G=A$7$+4>=A$ s=A$20=A$$>0=>=A$#0 U‰%28?=A$8*iA$P2$*$%&'*3$-*$2%J-*$2% Uh Câu 42: k 0A$[#4p2o$"C2 "doCS"#$$o$A$P2F">g  => $45 CK"$o$A+0A$>W  _A5h0$45 CK"+0A$W  J"#$ $P2F"$G !> R  g   S  g     g  U  g   Câu 43:-4H$P2A8+..L+.=>A,L(+   U @4H>T%/T%=>%S %  )k(; 1$ u4H'-$P2A,   U > R k(; S/k(; k(; Uk(; Câu 44: k =rsC2 a%K2=!' $0=>$%-J‰%•45=r4H$+> R/$0 S$0 $0 U$0 ND _⇒jR$0 Câu 45: k $E$L$G$a%C>$0C2 a%K2AL$G2$+3+45[x&  π = % -JC2 $P2$E$> R S  U  l T g π =  Câu 46: ND~0 %B*$z8*+2**LE$$G@T  lm.%x8*iA$P2%B> ˆj8..0>%B*8*+2+0 ,&ix8iz R  S )  ) U  W N Nhf P t t t ε = = = ⇒ Pt N hf = Câu 47:67"*8%9  $    π   π −  ÷    :;<=>2@%A0A$0E$8B0"+p$% $D0=>F "$G$45 CK"g%20A$>W  $    π   π +  ÷   :R<l"$.%x$P2A0A$ R S/T T U ϕϕ % −ϕ  −π1$ϕ/ Câu 48: _o$"#"0`,=a22=!**LE$$G4!$G λ ID$*$b22 -(c8>00_+'0>g%2*Ah0k$*$=,+%,000$G=,*r$Nb$O$*$a% -"-*$C$%&hC@0>g%2*C3$(45e=%.G$=!078e$f22-(+2i2$ -=,22Ak$%&h>=,@f2J-DCO$0>>0S4!$G λ  R 0µ S 0µ  0µ UT 0µ ND 200i00 [w$@%=,*- k D x a λ = :< I0>+2i2C@JU=>-…(C@w$k>=,@fJG>=,f-|=> U|UZ0⇒ : Ž < : <k D x a λ + + = :< _d:<=>:<%&+2U:UZ<⇒U0 _d:<⇒ ax kD λ =  −  0 0µ Câu 49: _+0 #"0=a22G4!$2%BG-H8C2 $•82A2h0R=> S$*$2%$0jG+%&a+'074!$=!4!$G$0_+'ARSh00>AG8@~4!$ C2 =!' $o$A> R S  U) l l k λ λ − < < Câu 50: 67"*8i2&$a%%9  $ ω :;<=>2@%0 "+p%@Y Ω J$45 CK "g%2"+p$G*+O"%CFRN*+O$P29 R; S  ; ; U  ; ND 9WY B. Theo chương trình Nâng cao (10 câu, từ câu 51 đến câu 60) Câu 51: k =r+Eg%2&g%20 +F$ ∆ $O=!$ G$+2C1k0(g%*#$P2=r+E=! +F$ ∆ >-0  k0( 4H$P2=r+E=!+F$ ∆ > R-0  1 S/-0  1 -0  1 UT-0  1 Câu 52:•($+>AL$x8% $A R0'm. S(8. %$. U8'+ Câu 53: _+'0 45+2&e$G0 %B,0jf&'8*+2,0=!@n=>0 0*&%k$%&h  +2i2j=!$ %S$ +%&a,0>=:=V%<_@$P2,00>0*&%r4H$> R n= = %+ S n := %< = +  n= = %− U n := %< = − Câu 54: k $E$Ki$G-4H=rs>  0 = C2 a%K2=!$%-Ju%2&=rs $G-4H0  =rs$G-4H0  J$E$C2 =!$%-JN*+O0   R S  UT Câu 55: 670 "*8i2&$a%$G*+O"%CF-.?=>@n2&?4H$=>2@%0 $%  $D0%@InlmJ$45 CK"g%2$% $D0$G*+O"%CFRInlmJ $45 CK"g%2$% $D0$G*+O"%CF RR SR R UR Câu 56: kA$C2 [#4p2A "#$$o$A$P2F">   g   − = =>$45 CK "$o$A+0A$>  W  0R= π _#d5h0"#$+'F>g  -D52Exh $45 CK"+0A$$G !W  > R  0  S    µ   0  U  0  Câu 57 :S2@%0 0€%$x8GiA%&'$x$Gu  A,S$%-J*+•$P2$x8GiA>&>_ j2%52_-hd5h02@%A,$428,+•$P20€%$x8GiA>&> R   u  S   u     u  U   u / Câu 58: l2g%D$@%s$G-4H@4H>-=>-Ep2@%0 2$f=>ck0( g%*#$P2"=!+F$g%2&g%2+%h0$P22=>=%.G$=!2>-0  a%C>$P2 2> R0 S0 /0 U0 Câu 59: k *i(2g%2&a%g%2+F$ ∆ $O=! >S00(g%*#$P2* i(=!+F$ ∆ >-0  _$ G$$P2*i(> R+2C1 S+2C1 +2C1 U+2C1 Câu 60: k •2+K8eB$x$G00(g%*#/-0  =!+F$ ∆ $Og%2,0•2=>=%. G$=!a07•26•2g%2&g%2 ∆ =!2$G$+2C1k0(o$*$CF'•2=!+F$ ∆ $G  !> Ru0 S /  u0 u0 U  / u0 . BAÌ GIẢI CHI TIẾT MỘT SỐ CÂU ÐỀ THI TUYỂN SINH ĐẠI HỌC KHỐI A, A1 NĂM 2013 Môn thi : VẬT LÝ – Mã đề : 426   

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