While having a B.S. in physics will likely be sufficient to enter all those graduate fields, it doesn't (as was stated above somewhere) qualify you for a whole lot outside of applying to graduate programs--or impressing people in fields of mostly liberal arts majors. So be absolutely sure you are comfortable with going directly into a gradate program after college. There are very few "cool" jobs you can get with just the bachelors. Out of my graduating physics class, all but one went on to graduate programs. That one individual took a job doing something for a patent office.