Description:
The major goal of physics education researchers is to identify the student difficulties in learning of conceptual andmathematical basis of physics. In order to answer the research question, phenomenographic approach was used in thedesign of this study to analyze data from the open ended questions with 15 upper undergraduate level students (aged21-23) in physics departments in Turkey by using representative convenience and purposeful sampling techniques.We have administrated a questionnaire with two open ended questions which covers the basic properties of quantummechanics and classical mechanics to learn the ideas of students. We have reported the results set of categories thatdescribe the participants’ approaches to understanding the quantum mechanics and classical mechanics.