Having a PhD in physics shows you're very inteligent and have insane mathematical skills. A lot of companies are willing to hire people who have advanced degrees, especially in mathetmatics, science, and engineering. It's not easy to get a graduate degree in physics, believe me. The curriculum for the bachleor's degree is pretty intense, imagine what graduate coursework is like. It's stressful, but rewarding.
You can get a job as a physicists, astronomer, engineer, mathematican, professor, or teacher. If you care about making the big bucks, you might want to try being an astronomer or physicists because they make around 80k a year. Mathematicans make good money also, but I don't think you would want to
study mathematics for the rest of your life. Anyway, there was a teacher at my old high school who had a PhD in physics and taught AP calculus BC and AP physics. You could teach at high school level if you want to, but you won't make nearly as much money as you would being a physicist or astronomer. Getting a job into the science field is very competitive, and if you have a master's degree and going against someone who has a PhD, more than likely the PhD will win.
As I said earlier, it's not easy getting a degree in Physics. If you really enjoy the subject and REALLY REALLY REALLY want to pursue it as a career, then go for it! I would keep in mind that you have to take a crap load of math and engineering courses, and you will study mathematical equations for the rest of your life. If you love to challenge yourself and enjoy math and science, then physics would be a great career for you!
I reccomend taking the astronomer route because astronomy is more interesting than physics and there's more branches of astronomy(astrobiology, astrochemistry, astrophysics, etc...)
I thought about majoring in physics, but I decided not to because I'm terrible at math and I don't think I could handle calculus one, two, three, and differential equations!
So I'm majoring in congintive science