Darmansyah, D., Chaidir, I. F., & Nuryantini, A. Y. (2025). EMPIRICAL VALIDITY OF SCIENCE ASSESSMENT INSTRUMENTS BASED ON PROBLEM SOLVING ON ELECTRICAL, MAGNETIC AND ENERGY MATERIALS. Jurnal PTK Dan Pendidikan, 11(02), 149–156. https://doi.org/10.18592/ptk.v11i02.19385