“EFFECTS OF PROBLEM BASED LEARNING APPROACH ON SECONDARY SCHOOL STUDENTS’ MOTIVATION TO LEARN PHYSICS IN ISIOLO COUNTY, KENYA” (2023) INTERNATIONAL JOURNAL OF ADVANCED RESEARCH AND REVIEW (IJARR), 8(7), pp. 13–24. Available at: https://www.ijarr.org/index.php/ijarr/article/view/421 (Accessed: 25 June 2026).