Acoustic Enึg as part of a course in physics is an abstract can be seen in the highly imaginative understanding. For that reason, researchers have explored concepts of understanding (Conception Understanding) on acoustic studies and motivation toward learning physics. Students of science teachers, college teachers, the Dong Chang. The target group are students, teachers, science teachers, college number of 33 people, the Dong Chang. Laos The study is in the April 2558 worn by Using quantitative research. The researchers collected data using test understanding of concepts and acoustic surveys to check the perception of students toward learning physics. The results showed that Students have understood the modules are perfectly correct understanding concepts. Understanding misconceptions Understanding concepts incomplete without an understanding of the concepts. By understanding the most misconceptions and understand concepts that must be lowered. Analysis of motivation to learn physics. Of course, all five aspects of intrinsic motivation (IM) and the motivation to work (CM) of self-determination (SD) and its influence on the results of the study (GM) that each student is. learning how to be descriptive of the motivation to learn physics at medium level of efficiency (SE) only on the lowest level.