Gelombang Bunyi
53
Kata Kunci
• cepat rambat bunyi • konstanta Laplace
• modulus Young • modulus Bulk
C 25:46A2DB232D3E?H:36BD23296?;25:
C
Tes Kompetensi Subbab
B
3,-0..6-6.5+0 +6?DE2?646A2D2?3E?H:52=282C2B3?5:C:52
A252CE9E
L;:236B2D=6E= 52?
6A2DB232D3E?H:A252CE9ELC2256?82? C +6?DE2?46A2DB232D3E?H:A252CE9E
L
6A2DB232D3E?H:52=282C 252=29
C
6B2A22946A2DB232D?H252=282C A252CE9EH2?8C22
:DE?846A2DB232D3E?H:A252C632D2?836C: Q
52? 8B2 4 6B2A22=:=:A2D29646A2D2?3E?H:A25232;25:
32?5:?82?56?82?646A2D2?3E?H:A2522=E:?:E ;:25E=EC.E?8E?DE32;252?2=E:?:E2C:?8
2C:?8Q 52?Q
C6BD22CC2 ;6?:C32;252?2=E:?:E2C:?82C:?88B2 4
52?8B2 4
C. Unsur Bunyi dan Pemanfaatan Gelombang Bunyi
,?CEBE?CEB3E?H:2?D2B2=2:?C63282:36B:ED
1. Tinggi Nada Bunyi
252A3292C2?C636=E?H2?52D6=296?86D29E:329G23E?H: 5:D:3E=2?=69CE2DE36?52H2?836B86D2B62:?32?H2;E=29
86D2B2?H2?85:92C:=2?52=2C2DEC6=2?8G2DED6BD6?DE3E?H:H2?8 5:92C:=2?22?C62:??H2B:?8
2528232B3C6B2?82?2D6B=:92DC652?86?6A6=2? 32D2?8=:5:5:;2B:;2B:B52C6A652H2?8C652?836BAED2B:2B52D6BC63ED
5:AED2BC62:?46A2D2A2293E?H:H2?85:92C:=2?22?C62:??H2B:?8 +6B?H2D2A252AED2B2?H2?8=232D3E?H:H2?8D6B56?82B36B?252
B6?529252C22DAED2B2?B52C6A6525:A6B46A2D3E?H:H2?8D6B56?82B 36B?252D:?88: 2=D6BC63ED63ED:2?329G2D:?88:?25236B82?DE?8
A2527B6E6?C:CE36B3E?H:
2. Kuat Bunyi
E2D 3E?H: H2?8 5:92C:=2? 36B82?DE?8 A252 2A=:DE5 86D2B2? 6B92D:2?3H2?86?6B2?82?A6B4322?A252C6?2B8:D2B
6D:=29C2=29C2DEC6?2B8:D2B56?82?C:A2?82?H2?8D:52D6B=2=E 36C2B6?82B2?32:32:E2D3E?H:H2?85:92C:=2?=2=E32?5:?82?
56?82?E2D3E?H:H2?85:92C:=2?=69C6?2BH2?8C22?2E?56?82? C:A2?82? H2?8 =63:9 36C2B 52B:A252 C6E=2 6D:2? 2?229 H2?8
6?892C:=2?3E?H:=63:9E2D
3. Warna Bunyi
-2B?23E?H:6BEA22?3E?H:92CH2?85:D:3E=2?=69CE2DE CE36B3E?H:E?H:8:D2B36B365256?82?3E?H:3:=2:DE2B6?2252
G2B?23E?H:6B36522?D6BC63EDD6B;25:2B6?2823E?82??2522D2C52? ?25252C2B52B:CE36B3E?H:36B36523652G2=2EAE?7B6E6?C:?H2C22
Gambar 3.3
Lidi dipegang oleh seorang anak dan ditempelkan pada jeruji
roda yang berputar.
Gambar 3.4
Percobaan kuat bunyi yang dihasilkan oleh getaran senar gitar
dengan a simpangan yang kecil dan b simpangan yang besar.
2
3
DIUNDUH DARI: WWW.BUKUPAKET.COM Sumber buku bse.kemdikbud.go.id
Mudah dan Aktif Belajar Fisika untuk Kelas XII
54
4. Batas Pendengaran
?52D6?DED6=296?86D29E:329G22?EC:252?96G2?5:=6?82A: 56?82? 2=2D A6?56?82B2? H2?8 C6AEB?2 2E? 62AE2?
A6?56?82B2??H236B365236522D2C62AE2?A6?56?82B2?5:EEB 36B52C2B2?7B6E6?C:3E?H:
2?EC:2?B2=6:=::32D2CA6?56?82B2?2?D2B2
96BDIC2A2: 56?82?
96BDI26B297B6E6?C:D6BC63ED5:?222?
C652?82?526B297B6E6?C:5:32G29
96BDI5:C63ED 52?526B295:2D2C7B6E6?C:56?82B2D2E5:2D2C
96BDI5:C63ED
636B2A296G2?2AE6?56?82B3E?H:E=DB2C?:3292?96G2? C6A6BD: 6=6=2G2B H2?8 6:=:: 2=2D A6?8=:92D2? D:52 C632: 2=2D
A6?56?82B2??H2 6?88E?22? 3E?H: E=DB2C?: E?DE 6?86D29E: 36?52H2?82525:56A2??H2
5. Pemanfaatan Gelombang Bunyi
