Abstrak -Telah dilakukan penelitian dan pengembangan media pembelajaran laboratorium virtual yang bertujuan untuk mengatasi miskonsepsi peserta didik materi fisika inti dan radioaktivitas Subjek uji coba adalah peserta didik kelas XII IPA SMA Binamu berjumlah 30 orang. Prosedur pengembangannya menggunakan model Four-D terdiri dari tahap pendefinisian, perancangan, dan pengembangan. Hasil penelitian menunjukkan (1) media laboratorium virtual model presentasi dan tutorial pada materi aktivitas zat radioaktif dan daya tembus sinar radioaktif diperoleh hasil valid dan reliabel. Setiap tampilan dilengkapi navigasi, petunjuk, hyperlink,dan fasilitas lainnya untuk memudahkan penggunaan program, (2) perangkat pembelajaran berupa Rencana Pelaksanaan Pembelajaran, Buku Bacaan, dan Lembar Kerja Peserta Didik selain dibuat dalam bentuk hardcopy, juga softcopy autorun CD. Penilaian menunjukkan valid dan reliabel, (3) aktivitas peserta didik di atas 85%, menunjukkan pembelajaran yang dilakukan mampu mengaktifkan peserta didik. Persentase persepsi peserta didik adalah 93,05% menunjukkan sangat setuju terhadap pembelajaran fisika berbasis media laboratorium virtual, (4) berdasarkan tes akhir, terjadi peningkatan pemahaman konsep yang baik peserta didik dibandingkan sebelum diberi media laboratorium virtual. Abstract -The develovment research of learning instrument of virtual laboratory was conducted which aimed at contending themisconception about nuclear physics. The subject of the study was 30 students grade XII IPA at SMA 1 Binamu,Jeneponto.The procedure of development referred to four-D model consisted of definition phase, design phase, and development phase. The result of the study revealed that (1) the virtual laboratory media developed in form of presentation and tutorial model that consisted of radioactivity-decay and emerge power of radioactive radiation gotten valid and reliable result.each of media display completed with navigation, program instruction, hyperlink and several other facilities to allow users to run the program.(2)the learning instrument in form of lesson plan, the textbook, and student's workbook presented in softcopy of CD autorun.product was valid and reliable. (3) the student's activities during the learning process were above 85%, show that the students agree with instrument physiscs learning basis on virtual laboratory. (4) according to the tes result, the concept comprehension of students was improve than before given virtual laboratory media.
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