Rizka Silviana Hartanti, Physics Education Postgraduate Program Universitas Negeri Semarang, Unnes Campus Bendan Ngisor Sampangan Semarang, Central Java,
Indonesia
Budi Astuti, Department of Physics, Universitas Negeri Semarang, Semarang State University, Campus Sekaran Gunungpati, Semarang, Central Java,
Indonesia