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In a university system, generally 80% of your courses are taken in your major, which is whatever you choose to study, e.g. physics</p>
<p>In a college system, generally 40% (i'm averaging) of courses are taken in your major. There are of course variations for specific majors.
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<p>I don't think it breaks down at all by university vs college. At universities like Columbia and Chicago the core takes up a lot of your time. At colleges like Amherst you can take a lot in your major, but do not have to. I don't know of a university that would require 80% of courses in your major. That would be an enormous commitment. Something like 25 out of 32 courses (4 a semester for 4 years). Even some engineering programs that specify a huge proportion of your coursework would reach that level only if you counted the humanities and social science courses at "in the major".</p>
<p>At many universities the courses required in the major might run on the order of 10-20, depending on the field, and assuming 4 per semester. </p>
<p>To the OP, in the US nearly all colleges expect people to study things outside of their area of specialization. Many college students specialize only to a small extent in college, and take the minimum courses in a single department required to get a degree. Most colleges require students to take courses across a broad range of fields, following on an old idea that there exists some common body of knowledge possessed by all educated people. In the old days, this meant everyone studied Greek and Latin. Today it usually means taking courses in literature, social science, languages, natural science, and something quantitative. Colleges vary widely in how much of this they require-from no "distribution" requirements, such as Amherst and Brown, to very highly structured curricula such as Columbia. </p>
<p>When do you focus on physics? Starting from first year you begin taking physics and math courses. However, you take other things as well. As time goes by, at most colleges, you complete your distribution requirements and focus more on your major. However, this depends on the college and how many other courses it requires. Places that require many non-science courses seem to graduate about the same number of successful scientists as to places that do not require any.</p>
<p>It all works, and students come out well educated at both ends of the spectrum. For most serious work in science, certainly in physics, one needs an advanced degree anyway.</p>