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A1 الشمري، خالد سيار. A2 علي، أكرم فتحي مصطفى AB The research aims to identify the Effect of different timing patterns using virtual laboratories on academic achievement of high school students in physics course. Quazi-experimental research design was used. Research sample consisted of 60 students from secondary school province Hafr Al-Batin in Saudi Arabia, who divided into three groups, each group consisted of 20 students. The first group studied by timing style before lesson when using virtual lab, and the second group studied by timing style during lesson when using virtual lab, while a third group studied style timing after lesson when using virtual lab. Results showed that there were significant differences in the samples means favoring after lesson when using virtual lab. (Published abstract) http://search.shamaa.org/abstract_en.gif ID 128045 OP ص ص. 109-123 T1 أثر اختلاف نمط توقيت استخدام المعامل الافتراضية على التحصيل الدراسي بمقرر الفيزياء لدى طلاب المرحلة الثانوية [مقال] UL 1 http://search.shamaa.org/fulltext.gif http://www.iijoe.org/v6/IIJOE_08_11_06_2017.pdf النص الكامل (PDF)