This issue (IRiP Volume 4 Issue 2 Year 2021) has been available online since 31st December 2021 for the regular issue of December 2021. All articles in this issue consist of 6 articles were authored/co-authored by 22 authors from 8 institutions, 2 Countries. Universitas Bangka Belitung (Indonesia), Universitas Indonesia (Indonesia), Universitas Ahmad Dahlan (Indonesia), Universitas Negeri Yogyakarta (Indonesia), Universitas Tanjungpura (Indonesia), Universitas Islam Negeri Sunan Kalijaga (Indonesia), Universitas Negeri Padang (Indonesia), Universiti Utara Malaysia (Malaysia).
(1) Department of Physics, Universitas Bangka Belitung (2) Department of Biology, Universitas Bangka Belitung (3) Department of Physics, Universitas Bangka Belitung (4) Department of Physics, Universitas Indonesia (5) Department of Physics, Universitas Bangka Belitung
(1) Postgraduate Program of Physics Education, Universitas Ahmad Dahlan (2) Postgraduate Program of Physics Education, Universitas Ahmad Dahlan (3) Postgraduate Program of Physics Education, Universitas Ahmad Dahlan (4) Postgraduate Program of Physics Education, Universitas Ahmad Dahlan (5) Department of Physics Education, Universitas Negeri Yogyakarta
(1) Department of Geophysics, Universitas Tanjungpura (2) Department of Geophysics, Universitas Tanjungpura (3) Department of Geophysics, Universitas Tanjungpura
(1) Department of Physics Education, Universitas Islam Negeri Sunan Kalijaga (2) Postgraduate Program of Physics Education, Universitas Ahmad Dahlan (3) School of International Studies, Universiti Utara Malaysia
👥 Dian Artha Kusumaningtyas(1)★, Dwi Sulisworo(2), Jumadi Jumadi(3), Edi Istiyono(4)
(1) Department of Physics Education, Universitas Ahmad Dahlan (2) Postgraduate Program of Physics Education, Universitas Ahmad Dahlan (3) Postgraduate Program of Physics Education, Universitas Negeri Yogyakarta (4) Physics Education, Universitas Negeri Yogyakarta
(1) Magister of Physics Educations, Universitas Negeri Padang (2) Magister of Physics Educations, Universitas Negeri Padang (3) Magister of Physics Educations, Universitas Negeri Padang