This research aims to assess the effect of problem based learning model with google classroom media on activity and student learning outcomes of sound wave material at Pakusari senior high school. This type of research is experimental research with pretest-posttest control design. Data collection of student learning outcomes are pretest and posttest scores, and student learning activities is from observation results during learning. The result of this research are the average of learning activities in experimental class greater than control class, i.e 66,35% and 55,31%, and also the average of student learning outcomes from posttest in experimental class greater than control class, i.e 60 and 50. Data analysis using T-test which results in significance value of learning activity and learning outcomes of less than 0,05, i.e 0,017 and 0,002. Based on analysis, it can be concluded that learning by problem based learning model with google classroom media has significant effect on student's activity and learning outcomes on sound wave material at Pakusari senior high school.