IMPROVEMENT OF STUDENTS’ SCIENCE PROCESS SKILLS IN SCAFFOLDING-BASED PROBLEM BASED LEARNING ON THE MATERIAL OF TRAVELLING WAVES AND STATIONARY WAVES. SPEKTRA: Jurnal Kajian Pendidikan Sains, [S. l.], v. 11, n. 1, p. 49–61, 2025. DOI: 10.32699/spektra.v11i1.7812. Disponível em: https://ojs.unsiq.ac.id/index.php/spektra/article/view/7812. Acesso em: 27 nov. 2025.