Mudah dan Aktif Belajar Fisika untuk Kelas XII
60
2. Pipa Organa dan Pola Gelombangnya
+6=29?526D29E:329G236?52H2?836B86D2B52A2D6?892C:=2? 3E?H:+:5292?H236?52A252DC6A6BD:52G2:D2=:2EAE?A6=2D=82
H2?852A2D36B86D2B86D2B2?AE?52A2DD6B;25:A25282C:C2=?H2E52B2 6D2B2?=E52B2A252C6BE=:?822?6?892C:=2?3E?H:+:?88:
?252H2?85:A6B=6952B:C63E29C6BE=:?852A2D5:2DEB7B6E6?C:?H2: 2?D2B2 A6B2?82D EC: C656B92?2 H2?8 52A2D 6?892C:=2? 86D2B2?
=E52B2C6=2:?C6BE=:?8252=29A:A2B82?2+6B52A2D5E2242 A:A2B82?2H2:DEA:A2B82?2D6B3E252?A:A2B82?2D6BDEDEA
a. Pipa Organa Terbuka
:A2B82?2D6B3E2252=292=2DD:EA36BEA2D23E?8H2?865E2E;E?8 A6?2A2?8?H2D6B3E265E2E;E?8A:A2B82?2D6B3E26?;25:A6BED
86=32?8A252=E52B2=286=32?8H2?85:92C:=2?C6A6BD: D2A2A2523 B6E6?C:H2?85:92C:=2?=69A:A2B82?2
D6B3E2252=29C63282:36B:ED 25252C2B
2D2E B6E6?C:H2?85:92C:=2?
Gambar 3.10
Seruling merupakan pipa organa terbuka.
6ED2C52G2:H2?865E2E;E?8?H2D6B:2D6:=::A2?;2?82CC2;6?:C?H2 8 4
6?892C:=2?7B6E6?C:?25252C2B I
2 :DE?8=2982H2D682?82?52G2: 3 6B2A22936C2B7B6E6?C:52?A2?;2?886=32?8A252?2522D2CA6BD22
4 +6?DE2?=297B6E6?C:52?A2?;2?886=32?8A25252G2:E?DE?2522D2C 65E2
7
:6D29E:
8 4 I
2 6?82?6?88E?22?3409E?DE?25252C2B5:A6B=69
2D2E
Q
N
8 4 I
25:36C2B82H2D682?82?52G2:252=29 3 B6E6?C:?2522D2CA6BD22252=29
2D2E I
I
2?;2?886=32?8A252?2522D2CA6BD22252=29 4 B6E6?C:A252?2522D2C65E2252=29
2D2E I
I
2?;2?886=32?8A252?2522D2C65E2252=29
2D2E
Contoh
3.5
6BC222?7B6E6?C:?252?252D6BC63ED2=:A6BD225:E?82A2?=69 3400C69:?8823409D6BC63ED5:6?2=56?82?6-6
3400
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Gelombang Bunyi
61
Gambar 3.11
Pola gelombang resonansi suatu pipa organa terbuka.
nada dasar atau harmonik pertama
nada atas pertama atau harmonik kedua
nada atas ketiga atau harmonik ketiga
1 2
1
3 2
2522D2CA6BD22 2D2E
B6E6?C:H2?85:92C:=2? 2522D2C65E2
2D2E B6E6?C:H2?85:92C:=2?
2522D2C6
?
B6E6?C:H2?85:92C:=2? N
6B32?5:?82?7B6E6?C:86=32?8H2?85::=::=E52B2A252 A:A2B82?2D6B3E2C2256?82?A6B32?5:?82?7B6E6?C:86=32?8
A25252G2:6B32?5:?82?7B6E6?C:H2?85:92C:=2?=69C6D:2AA=2 86=32?8E?DEA:A2B82?2D6B3E2252=29
N 3409 H2?86BEA22?A6B32?5:?82?7B6E6?C:5:6?2=
C63282: 6-6 3016..+52?6BEA22?A6B32?5:?82?3:=2?82? 3:=2?82?3E=2D
63E29A:A2B82?2D6B3E2A2?;2?8?H2
4+6?DE2? ?25252C2BH2?85:92C:=2?A:A2D6BC63ED;:246A2DB232D
3E?H:5:E52B2
C 7
:6D29E:A2?;2?8A:A2 4
46A2DB232D3E?H:
C 6?82?6?88E?22?34097B6E6?C:?25252C2B5:A6B=69
2D2E 22
Contoh
3.6
1 40cm
2
H2B2DD6B;25:?H2?25252C2BH2:DE
C I
63E29A:A2B82?2D6B3E2H2?8A2?;2?8?H252?7B6E6?C:92B?:?H2 36BDEBEDDEBED
I52?
I+6?DE2?46A2DB232D3E?H:A252A:A2B82?2
D6BC63ED
Contoh
3.7
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Mudah dan Aktif Belajar Fisika untuk Kelas XII
62
b. Pipa Organa Tertutup
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