Silaban, Yohansen Frando Hadinata, and Jumadi Jumadi. 2022. “oncept nderstanding rofile of igh chool tudents on oppler ffect and ound ntensity evels”. omentum: hysics ducation ournal 6 (1):51-58. https://doi.org/10.21067/mpej.v6i1.5664.