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, [S. l.], v. 10, n. 2, p. 268–279, 2024. DOI: 10.32699/spektra.v10i2.7801. Disponível em: https://ojs.unsiq.ac.id/index.php/spektra/article/view/7801. Acesso em: 25 nov. 2025.