PROGRAM STUDI FISIKA PASCASARJANA UNIVERSITAS ANDALAS PADANG 2011
1. Tentukan komutator-komutator a. [
]=[
]
=*
+
=*
+ ( ) +
= =
+
= b. [
]=[
]
Rumus komutator [
]
Sehingga: [
]
[
=[
]
= [2
[
]
[
]
]
]
=2 =2 c. [Lx,Ly] = [LxLy – LyLx] Lx = y pz – z py Ly = z px – x pz Lz = x py – y px = [(y pz – z py) (z px – x pz) - (z px – x pz) (y pz – z py)] = [(y pz z px - y pz x pz - z py z px + z py x pz) – (z px x pz - z px z py – x pz y pz - x pz z py)] = [y pz z px - x pz z py] =[ =[
px - x px - x
= = = d. [Lz ,L2] = [Lz L2 – L2 Lz] L2 = Lx2 + Ly2 + Lz2 Lz = x py – y px Lx2 = Lx Lx
py] py]
= (y pz – z py) (y pz – z py) = y pz y pz - y pz z py - z py y pz + z py z py = - y pz z py - z py y pz =
y py +
z pz
Ly2 = Ly Ly = (z px – x pz) (z px – x pz) = z px z px - z px x pz - x pz z px + x pz x pz = - z px x pz - x pz z px =
z pz +
x px
Lz2 = Lz Lz = (x py – y px) (x py – y px) = x py x py - x py y px - y px x py + y px y px = - x py y px - y px x py =
x px +
y py
Lx2 + Ly2 + Lz2 =
2
y py +
z pz +
z pz +
=2
y py + 2
=2
(x px + y py + z pz)
Lz L = (x py – y px) 2
z pz +
x px +
x px +
y py
x px
(x px + y py + z pz)
=2
(x py x px + x py y py + x py z pz - y px x px - y px y py - y px z pz
=2
(x py y py - y px x px)
=2
(x
=2
(x
L2Lz = 2
py – (x py –
=2 =2
py –
px) px)
px)
Lz (x px + y py + z pz) (x py – y px)
=2
(x px x py - x px y px + y py x py - y py y px + z pz x py - z pz y px
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