Mudah dan Aktif Belajar Fisika untuk Kelas XII
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2
3
Gambar 3.8
a Pada siang hari, arah rambat bunyi melengkung ke atas.
b Pada malam hari, arah rambat bunyi melengkung ke bawah.
Gambar 3.7
Proses pemantulan bunyi.
E:C2?82B:CH2?8?523E2DD6?D2?8CE5ED52D2?8CE5EDA2?DE= 52?82B:C?B2=A252A62?DE=2?3E?H:22?C2256?82?3
2528232BD6BC63EDD6B=:92D329G2CE5ED52D2?8CE5EDA2?DE= 52?82B:C?B2=D6B=6D2A252C2DE3:52?852D2B52?
6?82A23E?H:52=2BE2?82?D6BDEDEAD6B56?82B=63:96B2C6D2 5:?5:?8BE2?82?H2?8D6B=2=E562D6?H63232?3E?H:A2?DE=D:524EEA
G2DEE?DE6B232DC69:?8823E?H:52D2?852?3E?H:A2?DE=D6B56?82B C642B236BC222? 2=D6BC63ED63ED:2?329G23E?H:A2?DE=52A2D
6A6BE2D3E?H:2C=:?H2DE=29C6323?H2CE2B2EC:22?D6B56?82B=63:9 6B2C5:52=2BE2?82?52B:A2525:=2A2?82?D6B3E26B365256?82?862
H2?8D6B;25:;:2?5236BD6B:25:526B2936BD63:?82B2D63:?852? CE36B3E?H:H2?84EEA;2E96?H63232?3E?H:A2?DE=66B=E2?
G2DEH2?84EEA=22E?DE6B232DC2A2:A6?56?82B2?:32D?H2 3E?H:A2?DE=22?D6B56?82BC6D6=293E?H:2C=:636B2A2A6B:CD:G2D6BC63ED
6BEA22?A6?82=22?H2?8C6B:?8?52D6E2?
2. Pembiasan Gelombang Bunyi
?52 D6=29 6?86D29E: 86=32?8 3E?H: 6B232D6C6E22B2952?86=32?83E?H:D:52
52A2DD6BA=2B:C2C:6?82A2A2522=292B:CE2B2 25I2?2D2ECE2B2D6B:22?H2?84EEA;2E9D6B56?82B
=63:9;6=2C52B:A252C:2?892B:252C:2?892B:CE9E E52B25:A6BE22?=63:9D:?88:52B:A2525:2D2C?H2
2=D6BC63ED6?H63232?=2A:C2?E52B2A252328:2? 2D2C=63:9B2A2D52B:A2525:32G29?H2632=:?H2A252
2=292B:=2A:C2?E52B25:A6BE22?=63:9B2A2D 52B:A2525:2D2C?H2:32D?H2A252C:2?892B:;:2
CE36B 3E?H: 52D2?8 C642B2 9B:I?D2= D6B9252A A6?56?82B52A2D5:A2CD:2?2B29B232D3E?H:22?6=6?8E?862D2C
C652?82?A2522=292B:2B29B232D3E?H:22?6=6?8E?86 32G296B92D:2?3
A2H2?822? D6B;25:;:23E?H:52D2?8?H26B232DF6BD:2=6 32G292522=292B:2B29B232D3E?H:5:3:2C2?6?562D:82B:C
?B2=632=:?H2A252C:2?892B:2B29B232D3E?H:5:3:2C2?6?;2E9: 82B:C?B2=
6CE2: 56?82? 9EE A63:2C2? 86=32?8 329G2 86=32?8 52D2?852B:65:EEB2?8B2A2D665:E=63:9B2A2D22?5:3:2C2?
6?562D:82B:C?B2=2D2EC632=:?H2
3. Difraksi Gelombang Bunyi
A22986=32?83E?H:52A2D6?82=2:5:7B2C:2D2EA6=6?DEB2? 6B:CD:G2A6=6?DEB2?3E?H:52A2D5:22D:6D:2?526?56?82B56BE
3E?H:3:=6=:?D2C:526B29A6B3E:D2?H2?836B6=CE2B2A6B422A2? D62?D62??525:BE2?82?H2?836B36522D2E242A632D2C=6D
A632H2B2?5:C63E2932?H2?8C6?82;25:3E2D56?82?3636B2A2=E32?8 64:=282B86=32?83E?H:D:5262?DE=G2=2EAE?2B29B232D3E?H:
D:52 36BEA2 82B:C =EBEC +:82 A6B:CD:G2 D6BC63ED 6BEA22? 4?D9 A6?6B2A2?5:7B2C:3E?H:25:2A229H2?85:2CE556?82?5:7B2C:
:DE :7B2C: 252=29 A6B:CD:G2 A6=6?DEB2? 86=32?8 6D:2 6=6G2D: 46=29H2?8EEB2?46=29?H2C6B5656?82?A2?;2?886=32?8?H2
A N
C r
i
Pelayangan bunyi terjadi karena adanya interferensi dua gelombang
yang frekuensinya berbeda sedikit.
Ingatlah
DIUNDUH DARI: WWW.BUKUPAKET.COM Sumber buku bse.kemdikbud.go.id
Gelombang Bunyi
57
2=E 6?82A2 86=32?8 3E?H: E529 6?82=2: 5:7B2C: 6=32?83E?H:5:E52B26:=::A2?;2?886=32?8C6:D2B3636B2A2
C6?D:6D6B C2A2: 3636B2A2 6D6B 2?5:?82? 56?82? 4292H2 H2?8 6:=::A2?;2?886=32?836B:C2B
DE=29C6323?H286=32?8
3E?H:=63:9E529E?DED6B5:7B2C:
4. Interferensi Gelombang Bunyi
6D:2?5236B5:B:5:56A2?5E2 A6?86B2CCE2B2C63282: CE36B3E?H:6E5:2?36B;2=2?=EBECC6;2;2B56?82?82B:CA6?89E3E?865E2
D6BC63ED+2=22C6D6=29:DE?5222?6?56?82B3E?H:=629 52?C6C22D6E5:2?D6B56?82B3E?H:E2DE?H:E2DD6B;25:6D:2CEA6BAC:C:
52B:5E286=32?83E?H:6?892C:=2?:?D6B76B6?C:56CDBED:7?D6B76B6?C: D6BC63EDD6B;25:;:23652=:?D2C2??H26BEA22?6=:A2D2?3:=2?82?3E=2D52B:
C6D6?829A2?;2?886=32?83E?H:C642B22D62D:C5:DE=:C2?C63282:36B:ED 56?82?
52?36BDEBEDDEBEDE?DE3E?H:E2DA6BD223E?H: E2D65E252?3E?H:E2D6D:82
5. Pelayangan Bunyi
