I have just changed my major to physics (and math minor). I'm still not sure what field I will want to study in grad school, but I am most interested in: medical physics and radiology, astrophysics, particle physics, and nuclear physics. Currently, medicine and radiology holds the most interest for me, but I have a few questions about the field: What classes do graduate schools offering medical physics require, besides the usual physics and math courses? Will I need to take the MCAT in addition to the general GRE and physics GRE? What is the difference between getting a master's in health/medical physics and getting a bachelor's in radiology? For those in the field: Do you enjoy it? Is there anything else I should be considering? Any other questions, comments, and concerns are greatly appreciated. Thanks in advance guys!