[1] Univ Negeri Medan, Phys Dept, Medan 20221, Indonesia
[2] Univ Mataram, Postgrad Program, Master Sci Educ, Mataram 83115, Indonesia
[3] Sam Ratulangi Univ, Dept Phys, Manado 95115, Indonesia
[4] Politekn Kelautan & Perikanan Pangandaran, Dept Marine Technol, Pangandaran 395008, Indonesia