[jQuery] [ask] json return

hi i have a litle problem here T_T .. with json i try to load json and when i alert the result, the result is undefined is there something i missed ?

this is my json :

[{"idfakultas":"5","iduniversitas":"35","namaFakultas":"Fakultas Teknik","namaUniversitas":"Universitas Brawijaya","alamat":"Jl Veteran","website":"http:\/\/brawijaya.ac.id"},{"idfakultas":"11","iduniversitas":"35","namaFakultas":"tes","namaUniversitas":"Universitas Brawijaya","alamat":"Jl Veteran","website":"http:\/\/brawijaya.ac.id"}]

this is my jquery :
          $.getJSON("http://localhost/ci/index.php/skripsi/superAdmin/fakultasDropDown/"+id,
          function(data){
                    alert("tes ="+data.idfakultas);
          });

the alert output is tes =undefined

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