Mudah dan Aktif Belajar Fisika untuk Kelas XII
182
5. Aplikasi Radiasi Benda Hitam untuk Mengukur Suhu Matahari
2D292B: 6BEA22? 3:?D2?8 I2?8 A2=:?8 562D 56?82? E: ;2B2?I2C6:D2B 2D292B:62?42B2?6?6B8:2=B
I2?8C2?82D36B8E?2328:69:5EA2?5:E: ?6B8:D6BC63ED36B2C2= 52B: B62C: 7EC: 9:5B86? 5: 52=2 :?D: 2D292B: 2A2D29 ?52
632I2?82?36B2A236C2B6?6B8:I2?85:92C:=2?2D292B:C69:?882 C2A2:;2B2 6?6B8::DE2C:925236BEA24292I252?
2=B +25:2C:6?6B8:2D292B:C2?82D36C2BC6A6BD:I2?8D6=29?52A6=2;2B:
?D6?C:D2CB25:2C::?:36B32?5:?8=EBEC56?82?A2?82D6A2DCE9E?I2 6?EBEDD6B:B25:2C:I2?85:A2?42B2?:?:6:=:::?D6?C:D2CI2?8
36B36523652 .?DE=63:96292:?C6A:?:A6B92D:2?26 36B:ED:?:
266?E?;E2?CA6DBEB25:2C:2D292B:I2?85:EEB 5:=E2B2?82C2 B27:D6BC63EDC2?82D:B:A56?82?8B27::?D6?C:D2C
B25:2C:36?529:D2 =692B6?2:DEA2B22CDB?6?82CEC:2? 2D292B:C63282:36?529:D2C69:?8823:C25:9:DE?836B2A2CE9E5:
A6BE22?2D292B:56?82?6?88E?22?EE6B86C6B2?0:6? 2B: 8B27: D6B=:92D 329G2 ?:=2: :?D6?C:D2C 2C:E D6B52A2D A252
A2?;2?886=32?8C636C2B K526B29A2?;2?886=32?8C:?2B D2A2 6?EBEDEE6B86C6B2?0:6?22?5:52A2D2??:=2:CE9E
5:A6BE22?2D292B:C63282:36B:ED
2C
P
M
P P
,6=2:?E?DE6?8EEBCE9E2D292B:A6?6B2A2?B25:2C:36?52 9:D2:?:52A2D5:8E?22?E?DE6?8EEBCE9E3:?D2?8=2:??I2I2:DE
56?82?6?82?2=:C:CCA6DBE3:?D2?8D6BC63ED
Gambar 7.8
Grafik intensitas radiasi Matahari yang diukur di luar
angkasa. IWm
2
7
10 m
,2=29C2DE:CE8=32=I2?8C6B:?85:2?82D=692D:F:D2C=:?8E?82?9:5EA252=29 :CE D6?D2?8 A62?2C2? E: 52 C6328:2? ?682B2 2;E I2?8 D:52 2E
6?2?52D2?82?:+-1-D6?D2?8A632D2C2?252B6:C:82C52B::?5ECDB: 2C6:C::?:C6328:2?36C2B252=29
6?EBEDA2B229=:82C :?:=29I2?8
6?82:32D2?A62?2C2?E:2D2E5:6?2=56?82?:CD:=29. +.,- 2B:=29:?7B2C:52B:36B3282:CE36B3EE2;2=29:?D6B?6D
52?=2:?=2:?D6?D2?89E3E?82?2?D2B2676BE2924252?B25:2C:36?529:D2 :CEC:2?=2956?82?D62?C66=2C?52D6?D2?892=:?:
Mari Mencari Tahu
1 Å = 10
–10
m
Ingatlah
Tantangan
untuk Anda
Grafik pada Gambar 7.8 menunjukkan intensitas radiasi
Matahari yang diukur di luar angkasa. Apakah Anda bisa menduga
bagaimana grafik intensitas radiasi Matahari jika diukur di permukaan
Bumi? Apakah di seluruh tempat di permukaan Bumi intensitas radiasi
Matahari selalu sama? Jelaskan jawaban Anda dengan bahasa yang
mudah dipahami dan diskusikanlah bersama teman sekelas.
Kata Kunci
• benda hitam • radiasi benda hitam
• emisivitas benda • intensitas
• daya radiasi • spektrum
• energi radiasi • radiasi termal
DIUNDUH DARI: WWW.BUKUPAKET.COM Sumber buku bse.kemdikbud.go.id
Radiasi Benda Hitam
183
Gambar 7.9
a Cahaya sebagai gelombang; b Cahaya sebagai paket-paket
energi.
3 ,E9E6B;27:=26?DE?8CD6?52=2CE2DE=2AEA:;2B
252=29
52?6:C:F:D2C?I2 -6?DE2?=E2C A6BE22?7:=26?=2AEA:;2B0
,63E29=E32?864:=A2525:?5:?8-.+6?I6BEA2: 36?529:D2 :2=E2C?I24
52?CE9E?I2
L C22C6A6BD:CE9E5:52=2D2?EB36B2A2296?6B8:
I2?85:B25:2C:2?6=E2B=E32?8C6D:2A56D: =2+436BC:72DC6A6BD:36?529:D236B252
52=262522?C6:32?856?82?=:?8E?82??I2 -6B?I2D2 3=2 6?I6B2A 52I2 0 52B:
=:?8E?82??I2 6B2A229CE9E3=2:DE 2AEA:;2B52A2D5:2?882A36B36?DE3=2 2B:;2B:
=2AEA:;2BA6BD22252=295E22=:;2B:;2B:=2AE 65E2 ,E9EA:;2BA6BD2252?65E22C:?82C:?8
L52?
L -6?DE2??:=2:A6B32?5:?82?2?D2B2 52I22=BB25:2C:=2AEA6BD2252?=2AE65E2
?CD2?D26:C:F:D2CC63E2936?529:D2252=29 :DE?8=29:?D6?C:D2CB25:2C:I2?85:A2?42B2?2A23:=2
CE9E36?52:DE ,63E293=2=8256?82?;2B:;2B:45:A2?2C2?
252CE9E
L3=2=82:DE62?42B2?B25:2C: 56?82?52I2P
G2DD :DE?8=296:C:F:D2C3=2 =82D6BC63ED
:DE?8=2952I2I2?85:A2?42B2?=69C63E29E3EC I2?85:A2?2C2?9:?882
L E3ECD6BC63ED6:=::
A2?;2?8C:C:452?D6B3E2D52B:3292?56?82? 6:C:F:D2C
6?5262?42B2?B25:2C:56?82?
2H
? 6?52:DED6BEC6?82=2:A62?2C2?C69:?882
CE9E?I22=:=:A2DCE9EC6E=2 -6?DE2?=29
2H
C6D6=29A62?2C2?
Tes Kompetensi Subbab
A
6031-590918.-3
B. Dualisme Gelombang Partikel
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