Page 219 - PRAKTIS BELAJAR FISIKA SMA KELAS XII

"2$/ " "758.785 17,

+2'91'4 35*+2 ':53 5.8
6'1'. ?'4- 4*' 1+:'.;/ "758.785 '$1 $0%$1* 17,
:+4:'4- ;49;8 8'*/5'1:/,
6'1'. ?'4- 4*' 1+:'.;/ )363 34 @63 EG63: ?7?B7>3<3D; F7AD; 63@ ?A67> ?A67> 3FA? 7D43E;E
:+4:'4- 4;12/8 B363 ?A67> 3FA? +GF:7D8AD6 63@ 6;F3?43: 67@93@ 4747D3B3 BAEFG>3F A:D
47D:3E;> ?7@<7>3E=3@ 43:I3 3FA? 63>3? =73633@ EF34;> 63@ EB7=FDG? K3@9
6;B3@53D=3@ 3FA? :;6DA97@ 363>3: 6;E=D;F &A67> F7DE74GF F7>3: ?7>7F3==3@
63E3D 43:I3 3FA? F7DEGEG@ A>7: ;@F; 3FA? K3@9 47D?G3F3@ BAE;F;8 63@ 7>7=FDA@
K3@9 47D?G3F3@ @793F;8 &G3F3@ BAE;F;8@K3 =7?G6;3@ 6;E74GF BDAFA@
;F7?G=3@@K3 EFDG=FGD 3FA? ?7@K;E3=3@ 43@K3= B7DF3@K33@ >3@<GF3@
-7DEGEG@ A>7: 3B3=3: ;@F; 3FA? ;FG B3=3: :3@K3 F7D6;D; 3F3E BDAFA@ BDAFA@
747D3B3 :3E;> 7=EB7D;?7@ ?7@G@<G==3@ 43:I3 BDAFA@ 4G=3@>3: E3FG
E3FG@K3 B3DF;=7> B7@KGEG@ ;@F; =:;D@K3 B7DF3@K33@ F7DE74GF F7D<3I34
E7F7>3: E7AD3@9 8;E;=3I3@ "@99D;E !-%2 (!$6)#+ P ?7@7?G=3@
@7GFDA@ E74393; B7@KGEG@ ;@F; E7>3;@ BDAFA@ $76G3 B3DF;=7> B7@KGEG@ ;@F;
;@; 6;E74GF @G=>7A@
'7GFDA@ 363>3: B3DF;=7> @7FD3> K3@9 ?3EE3@K3 :3?B;D E3?3 67@93@ BDAFA@
P
&3EE3 BDAFA@ 63@ @7GFDA@ ?3E;@9 ?3E;@9 363>3: Q =9 63@

Q =9 #;=3 6;43@6;@9=3@ 67@93@ ?3EE3 7>7=FDA@ Q
P

=9 ?3EE3 BDAFA@ 63@ @7GFDA@ =;D3 =;D3 =3>;@K3 (>7: =3D7@3 ;FG
P
E7EG3; 67@93@ ?A67> 3FA? +GF:7D8AD6 ?3EE3 3FA? F7DBGE3F B363 ;@F; 3FA?
3D; E7>GDG: G@EGD K3@9 363 6; 3>3? :;6DA97@ 363>3: G@EGD K3@9
EFDG=FGD ;@F;@K3 B3>;@9 E767D:3@3 "@F; 3FA? :;6DA97@ :3@K3 F7D6;D; 3F3E
E74G3: BDAFA@ "@F; ;@F; G@EGD >3;@ F7DEGEG@ A>7: E7<G?>3: BDAFA@ 63@ @7GFDA@
#G?>3: BDAFA@ 63@ @7GFDA@ 63>3? ;@F; EG3FG G@EGD 47D4763 63D; G@EGD
>3;@@K3 (>7: =3D7@3 ;FG ;@F; 3F3G G@EGD 6;>3?43@9=3@ 47D63E3D=3@ <G?>3:
BDAFA@ 63@ @7GFDA@ 6; 63>3?@K3 ,G3FG G@EGD 1 K3@9 ?7?;>;=; BDAFA@
( / $ - $ + 63@ @G=>7A@ <G?>3: BDAFA@ 63@ @7GFDA@
, 6 , . $ 1 3F3G 1

$0(6 +$':,&. dengan: X = nama unsur,
< Z = nomor atom (jumlah proton), dan
A = nomor massa atom (jumlah proton dan neutron).
"@F; 3FA? EG3FG G@EGD 363 K3@9 ?7?;>;=; @A?AD 3FA? E3?3 F7F3B; @A?AD
?3EE3 47D4763 "@F; E7B7DF; ;@; 6;E74GF ! " ,74393; 5A@FA: A=E;97@
?7?;>;=; F;93 ;EAFAB K3;FG ( ( 63@ ( A@FA: >3;@ =3D4A@ <G93

?7?;>;=; F;93 ;EAFAB K3=@; 63@ #G?>3: ;EAFAB E7F;3B G@EGD

47D4763 4763 &7E=;BG@ @A?AD ?3EE3@K3 47D4763 ;EAFAB ?7?;>;=; E;83F
=;?;3 K3@9 E3?3
'3+9 .'*=/)1 9+58'4-
3;8/* ";:.+8,58* (+8.'9/2
3+4+3;1'4 0+4/9 6'8:/1+2 ('8;
?'4- 1+2;'8 *'8/ /4:/4?' ?'/:;
4+;:854 *+4-'4 )'8'
3+4*+*'.1'4 (+8/2/;3 25-'3 -7@FG=3@ <G?>3: BDAFA@ 63@ <G?>3: @7GFDA@ 63>3? ;@F; A=E;97@ ( 7D3B3=3:

1+ 6'8:/1+2 #+2'40;:4?'
.'*=/)1 3+4+2/:/ *+;:8/;3 <G?>3: 7>7=FDA@ 3FA? A=E;97@
./*85-+4 (+8': 95:56 !6!"
./*85-+4 /4/ */:+3;1'4 6'*'
*'4 */-;4'1'4 ;4:;1 3D; >3?43@9 1 63@ 7@93@ 67?;=;3@ <G?>3: BDAFA@@K3 363>3:

8+'1:58 4;12/8
63@ <G?>3: @7GFDA@@K3 P P (>7: =3D7@3 3FA? A=E;97@ @7FD3>
"80%(5 <G?>3: 7>7=FDA@ 63>3? 3FA? A=E;97@ E3?3 67@93@ <G?>3: BDAFA@@K3 K3=@;

!8'1:/9 +2'0'8 /9/1' ;4:;1 +2'9 &