Really, that's something that you should decide for yourself. For a start, do you LIKE physics enough, to study a lot of it? You should also check what a physics expert would work in, and whether there are sufficient job opportunities in your country. If you happen to live in the United States (or plan to live there in the future), you can check the information on the OOH (Occupational Outlook Handbook).
Yes. Sound is a major concern in physics.
There is not "one major branch of physics", there are several.
Chemistry, physics, earth science are the major braches of physical science.
grasslands
newton physics Quantum mechanics
classical physics and (Quantum or modern) Physics
physics
The two major divisions in physics are classical and modern physics. The subdivisions on the other hand are mechanics, thermodynamics, acoustics and so many more.
They should not be difficult for you. You can also look into just math as a major or take chem and physics together before you make up your mind.
I feel as if the person should do Physics instead of 4th year in foreign language. [EDIT] I'd say take the foreign language course instead because colleges like to see that you have 4 years of one foreign language. If you want to major in physics, then wait until college to start on your physics major. Until then, focus on getting into college first.
tacos
I majored in Physics.