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B1=@19 B5;9C1A ; H ," :D71 497D>1;1> ;?=D>9;1B9 :1A1; :1D8 Kata Kunci
2525A1@1 A92D ;9<?=5C5A 41> D>CD; 5;B@5A9=5> ?<58 @1A1 9<=DF1>
497D>1;1> D>CD; CD:D1> B91A1> A579?>1< B541>7;1> # • gelombang elektromagnetik
497D>1;1> D>CD; B91A1> 9>C5A>1B9?>1< % % !" 81>G1 • • spektrum
Extra Low Frequency (ELF)
=5=9<9;9 A5>C1>7 6A5;D5>B9 1>C1A1 # H B1=@19 # H G1>7 49;5>1< • Very Low Frequency (VLF)
45>71> 75<?=21>7 @5>45; 5<?=21>7 @5>45; 497D>1;1> ?<58 B5=D1 • • Medium Frequency (MF)
High Frequency (HF)
<1G1>1> A149? 41> ?@5A1C?A D>CD; ;?=D>9;1B9 :1A1; :1D8 B91A1> 41> ?@5A1B9 • Very High Frequency (VHF)
A141A CA1>B 8?A9H?> • Ultra High Frequency (UHF)
, 41> + =D<19 41A9 # H B1=@19 49 1C1B H 41> 497D>1 • • sinar inframerah
sinar tampak
;1> D>CD; B91A1> C5<5E9B9 41> A149? :D71 D>CD; ;?=D>9;1B9 C5<5@?> B5<D<5A • sinar ultraviolet
9 1C1B 6A5;D5>B9 9>9 >41 C5=D;1> 75<?=21>7 =9;A? 5<?=21>7 • sinar-X
9>9 25A1B1< 41A9 1<1C 1<1C AD=18 C1>771 B5@5AC9 ?$ % $ • sinar gamma
"% " $
)@5;CAD= B5<1>:DC>G1 141<18 B9>1A 9>6A1=5A18 B9>1A C1=@1; 41> B9>1A
D<CA1E9?<5C !5=D491> @141 B@5;CAD= C5A1;89A <19> 49C5=D;1> B9>1A
41> B9>1A
D2D>71> 1>C1A1 6A5;D5>B9 @1>:1>7 75<?=21>7 41> 35@1C
A1=21C 3181G1 141<18

c f K
!5C5A1>71>
35@1C A1=21C 3181G1 L = B

@1>:1>7 75<?=21>7 =5C5A
6A5;D5>B9 85ACH

Contoh 9.1

(149? @5=1>31A # 41@1C 49C1>7;1@ @141 6A5;D5>B9 # H 5A1@1 @1>:1>7
75<?=21>7 A149? @5=1>31A 9CD
"5"#
9;5C18D9
# H L H

L = B
+>CD; =5>G5<5B19;1>>G1 7D>1;1> &12"-"". ;
c
c f =1;1
f

L = B
=

L H
149 @1>:1>7 75<?=21>7 A149? @5=1>31A 141<18 =

Tes Kompetensi Subbab A
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@1 G1>7 49=1;BD4 45>71> 75<?=21>7 5<5;CA? G1>7 492541;1> 25A41B1A;1> 6A5;D5>B9>G1
=17>5C9; @1 @5A25411>>G1 45>71> 75<?=21>7 5<1B;1> B5C91@ B@5;CAD= 25B5AC1 1@<9;1B9>G1
=5;1>9; 41<1= C5;>?<?79
@1 G1>7 49=1;BD4 45>71> B@5;CAD= 75<?=21>7 *5>CD;1><18 @1>:1>7 75<?=21>7 5<5;CA?
5<5;CA?=17>5C9; =17>5C9; 49 41<1= AD1>7 81=@1 :9;1 49
&141 B@5;CAD= 75<?=21>7 5<5;CA?=17>5C9; ;5C18D9 6A5;D5>B9 75<?=21>7 C5AB52DC # H
C5A41@1C 25A=131= =131= :5>9B 75<?=21>7

Gelombang Elektromagnetik 203