ĐỘ LỆCH PHA GIỮA CÁC DAO ĐỘNG Câu 1: !"#$%&'()*+,( -.//0/+1 23%4 Câu 2:5+/0/+#"6/789:789:;/+9<3 =+> ??? ϕω += tAx @ =+> ϕω += tAx . 5+A3B ? xx + = ?4(cm =&C0DE ? $? ;F/GH%&CF/0D/ A.I%& B.H%& C&J%&D.?%& Câu 3:K+LMN5A8O(8/"+LL & +?u c t π = >P=6OO"Q R&KLS0"$P;$ R&KTU"F/L1 23BV Câu 4:"#WX89:; B& +> B =u c t x π π = − ETY+&ZA /0WX(/"4[&CW;\F/X/+"1 23Z9@? !@P\%@X\8/:? π @\" X $ 4 5"3 //+#"+89:;E ? $>B]ϕ ? ] π =@E $+>B]ϕ =&ZA^>ϕ _ϕ ? =^π /+`<889:;E$+>B] ? π =&&a//"F//+ R&ϕ ? $− 4 π & Z&ϕ ? $− ?J π & 5&ϕ ? $− [ 4 π & b&ϕ ? $− B I π & Câu 6. /0/+#"+QcE(89:;9< ? ? E R+> = K π = E R+> = K π π = + &ZA ? K 4 K B = &P)T/0d8/"" R&E$−?R& Z&E$ R − & 5&E$ R 4 − & b&E$−R& Câu 7.b/+`<8F///+#"6/789:789:; ==> H +>4 cmtx π π −= &ZA/+D89:; ==> H +> ? cmtx π π += &b/+D/ 89:; R& ==> H +>J cmtx π π += Z& ==> H +> cmtx π π += 5& ==> H +> cmtx π π −= b& ==> H +>J cmtx π π −= Câu 8. 5"0F/\`<8F///+#"6/789:& //+89: ;9< ? B+>? = B x t π = + >= 4 4+>? = B x t π = − >=&2\F/\e)TG R&?%& Z&%& 5&J%& b&?%& Câu 9. //+#"+89:;9<3 ? +> % => =x c t cm π π = − ? +> % H=> =x c t cm π π = − &b/+`<8F///+ R& 4 cm & Z& 4 4cm & 5& cm b& B H cm & Câu 10:> !="#d+(G/F/->%=/( /+Y+89:fDF/(8g-& /0WX"d+(-7 89:"#(/">=&ZA0WG"h:&KLS00XLE" 8& -/"S/i/+";0WjLE"81 A. 4 > = s B. 4 > = J s C. [ > = ?H s D. ? > = ?H s Câu 11:KL0RZd-"h8(*A<8/+Y+89:fD89: ;3" ? $/+k" $/+>k] ϕ =&lmn"0F/RZ9SRZ/++LnZ0 Wn/+G*U(n*+, 4 λ &l()F/ ϕ A& H π & B& 4 π & C& 4 B π D & 4 π Câu 12:KL0RZd-"h8(*A<8/+Y+89:fD89: ;3" ? $" $/+k&lmn"0F/RZ20W9SRZWn$ ? λ &CF/n"$/ ;F/W A&/&B&/& C& a D & 4a 5"?43K+LN5QO,RZ&2OT,QR+L/+N5L & + A q Q c t ω = &COTF/,QOZ B Q q = ;6O+L() A& ? Q ω & B& Q ω & C& 4 Q ω − D& 4 Q ω Câu 14:K+LMN5A8O(8/"+LL & +?u c t π = >P=6OO"Q R&KLS0" N $ P" 5 $_? P" M $? P;$ R&KTU"F/L1 23 V Câu 15: //+#"6/789:7A89:;E ? $ R ? +>kop%H=E $R +>kop=89:;/+`<8 E$I+>k]q=&20R ()rL;R ? ()3 R&?J 4 Z&[5&? 4 b&I 4 Pj,hY:9;jY+)s3 R R Rt $ R $ p p t H H ⇒ R ()rL*t()rL G? ⇒ t$π% R /E $R$?J ⇒ R ? $ R R $ ?J I $ I 4− − >=& Câu 16:Wi+/"+LLMN5A8h"hOE+/#"u/`9<&C u ? $H !OU"LrL+q ? $?&Cu ? $? !OU"\()+q $ & Cu 4 $I !;OU"F/LG R&J[B Z&BJH 5&H b&[J? C+q ? $? ⇒ v N? $v 5? ⇒ ?pN$ ? ?p&5 ⇒ N5$ ? >?p= >?= C+ϕ $ ⇒ ϕ $B ⇒ /ϕ $ N 5 v v M − $? ⇒ M$v N ov 5 /ϕ 4 $ N4 54 N4 54 N 5 ? ?JpN v v v v B >?Jp= N5 ? ?Jp5 $ $ $ & ? M v v 4 >Bp= N5 ? BpN Bp5 − − − − − − − /ϕ 4 $ >?Jp= ? B B >?p= $ $ >Bp= 4 4 B&4 I ? >?p= − − ⇒ >/ϕ 4 = $%I? ⇒ 4 ? ?H ? + J? J? = + = ϕ ⇒ +ϕ 4 $J[B& 5( K%?3v N? $v 5? K%3u $u ? ⇒ v N $Bv 5 +ϕ $ ⇒ ϕ $B ⇒ M$v N ov 5 ⇒ v 5 $M%4 ⇒ 4 5 $ pu M K%43u 4 $?&u ? ⇒ v N4 $&v 54 ⇒ 4 5 4 M M + J[B M >?= v > u = M M ?H > u = ϕ = = = + π + π Câu 17:W+LLE+/#"h48giA83Oe"M">N@=QO O"5&2d+/"+LLO(8E+/#"*O(8DSe/""/ "QO9<3" $J H +>k] p H =P" 5 $B +>ko p 4 =PO(8O"Qe/"Oe w M $H 4 P& OU"F/+LL R&JH& Z&IJ& 5&[4& b&HHB& 5 p p p q q $ ] $ H 4 H − ⇒ " 5 \+p%\" /8/+p% /q $/ p 4 $ N w w N w $ 4w N w $ w ] w $ Bw N w $ B 4>P=w $ ?>P= ⇒ M w ] w +q $ $ IJ w ⇒ Câu 18:2dO(8E+/#""$? +>ω=P+/"LhOeMA8Q5v 5 $ M&KLS0O(8DSOeP/x;O(8DSQ R&oP& Z&o 4 P& 5&P& b& 4 P& Kv 5 $M ⇒ w 5 $w M $?P M " $ $ M M 6 M w n $ M y8QOD\8++LzQ53 M 5 5 M 5 " > = " " M ] $ ? $? w w n ? > = M ⇒ + 5 5 " $ [ " $ { 4P⇒ ⇒ @;/xm 5 " $ 4P− ĐỘ LỆCH PHA GIỮA CÁC DAO ĐỘNG Câu 1: !"#$%&'()*+,( -.//0/+1 Câu 2:5+/0/+#"6/789:789:;/+9<3 =+> ??? ϕω += tAx @ =+> ϕω += tAx . 5+A3B ? xx + = ?4(cm =&C0DE ? $? ;F/GH%&CF/0D/ A.I%& B.H%& C&J%&D.?%& Câu 3:K+LMN5A8O(8/"+LL & +?u c t π = >P=6OO"Q R&KLS0"$P;$ R&KTU"F/L1 Câu 4:"#WX89:; B& +> B =u c t x π π = − ETY+&ZA /0WX(/"4[&CW;\F/X/+"1 Câu 5: //+#"+89:;E ? $>B]ϕ ? ] π =@E $+>B]ϕ =&ZA^>ϕ _ϕ ? = ^π/+`<889:;E$+>B] ? π =&&a//"F//+ R&ϕ ? $− 4 π & Z&ϕ ? $− ?J π & 5&ϕ ? $− [ 4 π & b&ϕ ? $− B I π & Câu 6. /0/+#"+QcE(89:;9< ? ? E R+> = K π = E R+> = K π π = + &ZA ? K 4 K B = &P)T/0d8/"" R&E$−?R& Z&E$ R − & 5&E$ R 4 − & b&E$−R& Câu 7.b/+`<8F///+#"6/789:789:; ==> H +>4 cmtx π π −= &ZA/+D89:; ==> H +> ? cmtx π π += &b/+D/ 89:; R& ==> H +>J cmtx π π += Z& ==> H +> cmtx π π += 5& ==> H +> cmtx π π −= b& ==> H +>J cmtx π π −= Câu 8. 5"0F/\`<8F///+#"6/789:& //+89: ;9< ? B+>? = B x t π = + >= 4 4+>? = B x t π = − >=&2\F/\e)TG R&?%& Z&%& 5&J%& b&?%& Câu 9. //+#"+89:;9<3 ? +> % => =x c t cm π π = − ? +> % H=> =x c t cm π π = − &b/+`<8F///+ R& 4 cm & Z& 4 4cm & 5& cm b& B H cm & Câu 10:> !="#d+(G/F/->%=/( /+Y+89:fDF/(8g-& /0WX"d+(-7 89:"#(/">=&ZA0WG"h:&KLS00XLE" 8& -/"S/i/+";0WjLE"81 A. 4 > = s B. 4 > = J s C. [ > = ?H s D. ? > = ?H s Câu 11:KL0RZd-"h8(*A<8/+Y+89:fD89: ;3" ? $/+k" $/+>k] ϕ =&lmn"0F/RZ9SRZ/++LnZ0 Wn/+G*U(n*+, 4 λ &l()F/ ϕ A& H π & B& 4 π & C& 4 B π D & 4 π Câu 12:KL0RZd-"h8(*A<8/+Y+89:fD89: ;3" ? $" $/+k&lmn"0F/RZ20W9SRZWn$ ? λ &CF/n"$/ ;F/W A&/&B&/& C& a D & 4a 5"?43K+LN5QO,RZ&2OT,QR+L/+N5L & + A q Q c t ω = &COTF/,QOZ B Q q = ;6O+L() A& ? Q ω & B& Q ω & C& 4 Q ω − D& 4 Q ω Câu 14:K+LMN5A8O(8/"+LL & +?u c t π = >P=6OO"Q R&KLS0" N $ P" 5 $_? P" M $? P;$ R&KTU"F/L1 23 V Câu 15: //+#"6/789:7A89:;E ? $R ? +>kop%H=E $R +>k op=89:;/+`<8E$I+>k]q=&20R ()rL;R ? ()3 R&?J 4 Z&[5&? 4 b&I 4 Câu 16:Wi+/"+LLMN5A8h"hOE+/#"u/`9<&C u ? $H !OU"LrL+q ? $?&Cu ? $? !OU"\()+q $ & Cu 4 $I !;OU"F/LG R&J[B Z&BJH 5&H b&[J? Câu 17:W+LLE+/#"h48giA83Oe"M">N@=QO O"5&2d+/"+LLO(8E+/#"*O(8DSe/""/ "QO9<3" $J H +>k] p H =P" 5 $B +>ko p 4 =PO(8O"Qe/"Oe w M $H 4 P& OU"F/+LL R&JH& Z&IJ& 5&[4& b&HHB& Câu 18:2dO(8E+/#""$? +>ω=P+/"LhOeMA8Q5v 5 $ M&KLS0O(8DSOeP/x;O(8DSQ R&oP& Z&o 4 P& 5&P& b& 4 P& . ĐỘ LỆCH PHA GIỮA CÁC DAO ĐỘNG Câu 1: !"#$%&'()*+,( -.//0/+1 23%4 Câu. + 5 5 " $ [ " $ { 4P⇒ ⇒ @;/xm 5 " $ 4P− ĐỘ LỆCH PHA GIỮA CÁC DAO ĐỘNG Câu 1: !"#$%&'()*+,( -.//0/+1 Câu