Bài giảng SÓNG ÁNH SÁNG HẾT CHUYÊN ĐỀ
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Gv: Nguyễn Văn Lâm - Trắc nghiệm cơ bản về sóng ánh sáng
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Gv: Nguyễn Văn Lâm - Trắc nghiệm cơ bản về sóng ánh sáng
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Gv: Nguyễn Văn Lâm - Trắc nghiệm cơ bản về sóng ánh sáng
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Gv: Nguyn Vn Lõm - Trc nghim c bn v súng ỏnh sỏng
Câu 46. Trong thí nghiệm Young về giao thoa ánh sáng, khoảng cách giữa hai khe là a = 1mm, khoảng cách từ hai khe
đến màn là D = 2m. Chiếu đồng thời hai bức xạ đơn sắc có bớc sóng
$AGH
à=
và
$FGH
+
à=
vào hai khe thì thấy
trên màn có những vị trí tại đó vân sáng của hai bức xạ trùng nhau. Khoảng cách nhỏ nhất giữa hai vị trí trùng nhau đó
là: A. 4 mm B. 5 mm C. 6 mm D. 7,2 mm
Câu 47. Trong một thí nghiệm Young với bức xạ có bớc sóng
$FTGH
à=
, ngời ta đo đợc khoảng vân i là 0,42 mm.
Thay bức xạ trên bằng bức xạ
thì khoảng vân đo đợc là 0,385 mm. Bớc sóng
có giá trị là:
A. 0,646
$
à
B. 0,702
$
à
C. 0,587
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à
D. 0,525
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$TGH
+
µ=λ
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E*+GT$$* *GF$$* *9G+$$* 0*TG[$$
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'S(><?fGA*BC('D()%& '&>< )<" ?f
E*+H$* *F9H$* *+[H$* 0*T+H$*
F+ ! "#$"% %& '&7C" %"I J(&( %HGA$$G$>b%'&4y''7C"$y
P z( X% %"I J7>(&( %"I J$342+$* "M$3?X(Y24R'S((D
λ
,HGA
µ
$7>+I J*2"4"5$6
(&( 7$h$$=>
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F9* n( "#"% %& '&7C" %"I J(&( %%,G+$$*6>b%'&(&( %"I J$3I K
0,GA$* "M'& %"I J?f& '&S(DHGTH
$
µ
$QFGH
µ≤λ≤
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A$$(D?% "O"%4R'S(( 7`"m
E*T *A *F 0*Q
FT-‹Hh. ! "#$7a"% %& '&G %"I J4Be(( "M?f& '&S(D?BC('D
LHG9[µ$4MHGQFµ$*2"7\!7'&?@(T()%& '&4R'S((D?BC('DHGQFµ$(Š(D?% "O7'&
8%()%(&(& '&4R'S(I &(m
E*9* *[* *Q* 0*T*
FA-‹Hh. ! "#$7a"% %& '&GI K(&( "8% %"I J=>HGA$$GI K(&( L
%"I J4M$>b%'&=>+$*V'&j^ ! "#$V$ %"?X(Y2(D?BC('Dλ
,TAH$7>λ
+
,
FHH$*O$>b%'&Gc"6G=> %"4"5$i(^$3P !%'7C"7$7>(&( 7$=…=Be
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E*T* *+* *A* 0*9*
FF-‹Hh. ! "#$7a"% %7C"& '&4R'S(GI K(&( "8% %"I J=>$$GI K
(&( L$yP z( X% %"I J4M$>b%'&=>+$7>I K7=>HG[$$* (,9*H
[
$q'*…'`& '&
4R'S(j^ ! "#$=>
E*AGA*H
T
•* *TGA*H
T
•* *QGA*H
T
•* 0*FGA*H
T
•*
FQ-‹Hh. ! "#$7a"% %& '&GI K(&( "8% %"I J=>HGA$$GI K(&( L
$yP z( X% %"I J4M$>=>+$* '&4R'S(j^ ! "#$(D?BC('DHGAµ$*^"% %
O$>3+F$$-7$i( ! "8%.*`7'&=>
E*A* *Q* *9* 0**
F[-‹Hh. ! "#$7a"% %& '&GV'&V$(&(?X(Y2(D?BC('D=…=Be=>
λ
,QAH$G
λ
+
,FQA$7>
λ
9
,FHH$*2"4"5$67^"% %O$>$> "#I K(&( 4M %"I J
?fGA
µ
$(D7'&()%?X(Y2
E*
λ
+
7>
λ
9
* *
λ
9
* *
λ
* 0*
λ
+
*
Fh-‹Hh. ! "#$7a"% %7C"& '&4R'S(GI K(&( "8% %"I J=>$$GI K
(&( L$yP z( X% %"I J4M$>=>+$* #7O$>G7'&?@(9(&( 7$+GT$$*
BC('D()%& '&4R'S(j^ ! "#$=>
E*HGAU$* *HGQU$**HGTU$* 0*HGFU$*
QH ! "#$"% %& '&?fI JŽ-.* ?"M
+
,%,$$GI K(&( "8% %"
I J
+
4M$>-_.=>+$G?BC('D& '&j^ ! "#$=>
HGAH m
λ µ
=
/Y=>I K(&( L4"5$6
O$>4M7'&( ! "8%-7'&$.*N K(&( L7'&?@(9?O><7$4M7
'&?@(Q?OI"%7$=>
E*$$ *H$$ *HG$$ 0*HH$$
A
