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2024. THE EFFECTIVENESS OF AUDIO VISUAL-ASSISTED PROBLEM BASED LEARNING IN IMPROVING STUDENTS’ COGNITIVE AND PROBLEM SOLVING ABILITIES ON ALTERNATIVE ENERGY MATERIALS. SPEKTRA: Jurnal Kajian Pendidikan Sains. 10, 2 (Oct. 2024), 268–279. DOI:https://doi.org/10.32699/spektra.v10i2.7801.