Here's some background about me. I'm a senior undergraduate student in china, majoring EE. I'm about to graduate in about half a month. I got a job offer as an engineer which starts in July. But I am planning on applying for a physics PHD in US in a year or two. What I have been wondering is that how does a prof decide if a non-physics major student is qualified to join his program? Even if I have been studying physics in my spare time in college, there's no way of proving it. Some say that the GRE physics subject can be a qualification, but physics major students take it too. If a physics major undergraduate and a non-physics undergraduate get the some score, there's no doubt that the physics major undergraduate has the advantage. How can I prove that I am qualified without a bachelor's degree in physics?