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KELOMPOK11 :
GUSNAWATI (A24115093)
RENIARTHA P.(A24115099)
OLEH :
STATISTI FERMI-DIRAC
Statistik Fermi-Dirac
Statistik Fermi-Dirac adalah statistik untuk
partikel yang mengikuti prinsip larangan Pauli.
Partikel Jenis Ini disebut fermion. Salah satu sifat
yang dimiliki fermiona dalah terpenuhinya prinsip
Ekslusi Pauli. “Tidak boleh lebih dari satu fermion
memiliki keadaan kuantum yang sama. Satu
keadaan hanya boleh kosong atau hanya ditempati
oleh satu fermion”
Menghitung peluang Statistik
Fermi-Dirac
Misal, kita ambil contoh sebuah sistem dengan dua cell i dan j,
masing-masing dibagi menjadi empat kompartemen, dan anggaplah
makrostate Ni = 3, dan Nj = 1. Gambar tersebut menunjukkan cell i
dan j terlihat bahwa tidak boleh lebih dari satu titik tiap
kompartemen, dengan demikian ada 4 cara susunan tiga titik fase di
dalam cell i, dan empat cara susunan sebuah titik di dalam cell j.
Peluang thermodinamika masing-masing cell adalah:
Wi = 4, Wj = 4
Untuk setiap susunan di dalam cell i kita dapat
memiliki salah satu susunan di dalam cell j. Dengan
atau
demikian jumlah total kemungkinan susunan
peluang thermodinamika dari makrostate adalah :
W = Wi Wj = 16
Berbeda dengan hasil statistik Mxwell-
Boltzmann untuk kasus yang sama di mana diperoleh
W = 4, serta untuk staistik Bose-Einstein W = 80.
Secara umum untuk sejumlah cell dalam
statistik Fermi-Dirac dapat dirumuskan :
W = Π Wi
Di dalam pembahasan statistik sebelumnya
telah dikaji jumlah cara untuk N partikel yang
didistribusikan diantara cell-cell dalam ruang fase,
dengan N1, N2, dst. Jumlah tersebut yaitu:

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ppt-fermi-dirac.pptx

  • 1. KELOMPOK11 : GUSNAWATI (A24115093) RENIARTHA P.(A24115099) OLEH : STATISTI FERMI-DIRAC
  • 2. Statistik Fermi-Dirac Statistik Fermi-Dirac adalah statistik untuk partikel yang mengikuti prinsip larangan Pauli. Partikel Jenis Ini disebut fermion. Salah satu sifat yang dimiliki fermiona dalah terpenuhinya prinsip Ekslusi Pauli. “Tidak boleh lebih dari satu fermion memiliki keadaan kuantum yang sama. Satu keadaan hanya boleh kosong atau hanya ditempati oleh satu fermion”
  • 3. Menghitung peluang Statistik Fermi-Dirac Misal, kita ambil contoh sebuah sistem dengan dua cell i dan j, masing-masing dibagi menjadi empat kompartemen, dan anggaplah makrostate Ni = 3, dan Nj = 1. Gambar tersebut menunjukkan cell i dan j terlihat bahwa tidak boleh lebih dari satu titik tiap kompartemen, dengan demikian ada 4 cara susunan tiga titik fase di dalam cell i, dan empat cara susunan sebuah titik di dalam cell j.
  • 4. Peluang thermodinamika masing-masing cell adalah: Wi = 4, Wj = 4 Untuk setiap susunan di dalam cell i kita dapat memiliki salah satu susunan di dalam cell j. Dengan atau demikian jumlah total kemungkinan susunan peluang thermodinamika dari makrostate adalah : W = Wi Wj = 16
  • 5. Berbeda dengan hasil statistik Mxwell- Boltzmann untuk kasus yang sama di mana diperoleh W = 4, serta untuk staistik Bose-Einstein W = 80. Secara umum untuk sejumlah cell dalam statistik Fermi-Dirac dapat dirumuskan : W = Π Wi
  • 6. Di dalam pembahasan statistik sebelumnya telah dikaji jumlah cara untuk N partikel yang didistribusikan diantara cell-cell dalam ruang fase, dengan N1, N2, dst. Jumlah tersebut yaitu: