This study aims to determine students' attitudes towards waves as a subject during its application according to the inquiry- based learning approach and to determine their views on the teaching process of physics classes. The study was conducted with the participation of 10th grade students of an Anatolian high school in the spring semester of the 2017-2018 academic year. In the study, the embedded experimental design was adopted, which is one of the mixed method researches-attitude scale for the waves, and semi-structured interviews were used as data collection tools. In the analysis of the quantitative data, paired-samples t-test, and descriptive analysis used. The content analysis is used for the analysis of qualitative data. At the end of the study, it is determined that there is a significant difference in students' attitude levels and that their attitude increased in the post-test. About the teaching process of physics classes, it is determined that students' views have changed positively and that the students support inquiry-based learning applications. Given the fact that students support a learning approach based on inquiry rather than a traditional one, it can be suggested to spread such learning approaches in the field.