Physics
the direct routeCovers classical and quantum mechanics, electromagnetism, thermodynamics and statistical mechanics — the shared core every subsequent specialization builds on.
Darker cells mean a higher score for this topic on that metric.
Resists AI65
Pay58
Barrier to entry84
Autonomy62
Demand55
Impact88
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Last reviewed Sources & creditsMedia creditsMethodology
Quick answers
What does a physicist actually do day to day?
Most physicists specialize early into theory, experiment or computation, and spend their days running calculations, analyzing data, writing code or maintaining apparatus rather than making dramatic discoveries. A large share of the job is incremental: checking a result three different ways, writing it up precisely, and defending it to skeptical colleagues before it counts as established.
Do I need a PhD to work as a physicist?
For research roles, academic or industrial, yes — a PhD is the field's real credential, since almost no employer trusts someone to design original research without one. A bachelor's or master's degree in physics is still valuable outside pure research, opening engineering, data science, finance and teaching roles that use physics training without the title.
Is the academic physics job market really as brutal as people say?
Yes. Physics PhD programs in the US alone graduate roughly 1,800 people a year, while tenure-track openings number in the low hundreds; most physics PhDs never hold a permanent academic position. The training is genuinely excellent for analytical work generally, which is why so many physicists end up well paid in finance, tech or industry instead.
How much do physicists earn?
It varies enormously by sector and country. US graduate stipends run around $30,000 a year and postdocs around $60,000, while the median physicist across all sectors earns roughly $150,000 in the US. Physics PhDs who move into quantitative finance can earn several times that, while academic salaries in most other countries are far more modest.
What's the difference between a theoretical and an experimental physicist?
Theorists build and refine the mathematical models that describe how the universe should behave, working mostly with calculations, computers and chalkboards. Experimentalists design and run the apparatus — particle detectors, telescopes, cryostats — that test whether those models actually hold up against reality. Most physicists specialize firmly in one track early in graduate school.
Is physics at risk from AI?
Parts of it. Literature search, first-draft coding, routine data cleaning and figure generation are increasingly AI-assisted. What resists automation is deciding which question is worth years of a career, designing an experiment that can actually answer it, and taking personal responsibility for a claimed result — judgment calls current AI systems cannot be held accountable for.
Unlike medicine or law, physics has no license standing between a graduate and the job — anyone can call themselves a physicist, and what actually gates entry is a long, informal filter of exams, publications and hiring committees rather than a single professional board.
What replaces licensing is the PhD itself, treated almost universally as the field's real credential, followed by one or more postdoctoral positions that function as an extended, competitive audition for the small number of permanent research jobs — academic or industrial — that exist at the far end of the pipeline.
The route in
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1
Foundations
3–4 yrsStrong secondary-school mathematics and physics, often reinforced by physics olympiads or independent problem sets, since university physics programs assume genuine fluency in calculus before the first lecture.
The filterUniversity entrance exams or a secondary-school leaving qualification with advanced mathematics and physics.
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2
Bachelor's degree
3–4 yrsAn undergraduate physics degree covering classical mechanics, electromagnetism, quantum mechanics and thermodynamics, alongside heavy mathematics coursework and a first taste of a research lab.
The filterWeed-out courses in mechanics and electromagnetism that a large share of first-year students do not pass or switch out of.
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3
PhD admission & qualifying exams
1–2 yrsGraduate coursework deepens into a specific subfield — condensed matter, particle physics, astrophysics — followed by written and often oral qualifying exams testing whether a student is ready to do original research.
The filterQualifying (comprehensive) exams; failing them a second time typically ends the PhD attempt.
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4
Dissertation research
3–5 yrsYears spent on a single original research question, under an advisor, producing the experiments, data or theory that become the dissertation and, usually, several published papers.
The filterA public thesis defense before a faculty committee that can request revisions or, rarely, fail the candidate.
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5
Postdoctoral research
2–6 yrs, often multiple positionsOne or more short-term research contracts, frequently requiring international moves, meant to build an independent publication record before a permanent job search.
The filterCompetitive postdoc hiring committees; a thin or narrow publication record ends the academic track here for many.
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6
Independent researcher
open-endedA tenure-track professorship, a permanent national-laboratory staff position, or a senior industry research role where the physicist sets their own research direction and answers for it directly.
The filterTenure review, a permanent-position hiring committee, or, in industry, sustained delivery against a research budget.
PhD in Physics (typical funded doctoral program, US or Europe)
$0 tuition + years of low income
Physics PhD programs in the United States and most of Europe are typically fully funded: tuition is waived and the university pays a modest living stipend, unlike medical or law school. The real cost is the five to seven years spent earning $28,000–$40,000 a year instead of an industry salary, plus, for many, one or more additional postdoctoral years at similarly modest pay before a permanent job.
What to study
Mathematics
for theoretical workA strong secondary or double major in mathematics, especially analysis and differential geometry, is common among students headed toward theoretical or mathematical physics.
Electrical Engineering
for instrumentation-heavy workProvides the circuit design and signal-processing skills experimental physicists need to build the detectors, amplifiers and control electronics their experiments depend on.
Astronomy / Astrophysics
for the observational routeA dedicated astrophysics track adds observational technique, telescope instrumentation and cosmology to a physics core, for students headed toward space and observational research.
Computer Science
for computational and quantum-computing rolesGrowing subfields — lattice QCD, machine-learning-assisted data analysis, quantum computing — increasingly hire physics graduates who also have a real computer science background.
Where it is taught best
Massachusetts Institute of Technology
United StatesIts physics department has produced dozens of Nobel laureates and anchors a large share of US experimental particle and condensed-matter physics.
University of Cambridge
United KingdomHome to the Cavendish Laboratory, founded in 1874, where the electron, the neutron and the structure of DNA were all first identified.
ETH Zurich
SwitzerlandEinstein's alma mater and a major partner institution for CERN, with strong programs in both theoretical and particle physics.
University of Tokyo
JapanRuns the Kamioka Observatory's neutrino experiments and produced 2002 Nobel laureate Masatoshi Koshiba.
Ludwig Maximilian University of Munich
GermanyContinues a physics tradition that includes Max Planck and Werner Heisenberg, closely linked to the nearby Max Planck Institutes.
Lomonosov Moscow State University
RussiaThe flagship of a Soviet-era physics tradition, including Lev Landau's influential theoretical-physics school, that still trains a large share of Russia's physicists.
Tata Institute of Fundamental Research
IndiaIndia's leading graduate physics research institute, founded in 1945 by Homi Bhabha, closely tied to India's national space and nuclear programs.
Peking University
ChinaChina's oldest modern physics department, a major feeder into the Chinese Academy of Sciences' rapidly expanding physics institutes.
Licences and exams
PhD in Physics
GlobalThe field's real credential: without a doctorate, almost no independent research position, academic or industrial, is open, since the degree itself certifies the ability to design and complete original research.
Chartered Physicist (CPhys)
United Kingdom / CommonwealthAwarded by the Institute of Physics to experienced physicists who meet a defined competency standard, a professional mark of standing rather than a legal requirement to work.
DOE Q clearance
United StatesA high-level security clearance the US Department of Energy requires for physicists working on classified nuclear-weapons research at national laboratories such as Los Alamos or Lawrence Livermore.
Marie Sklodowska-Curie Actions fellowship
European UnionA competitive, EU-funded postdoctoral fellowship that funds early-career researchers to work across borders, a credential that carries real weight on a European academic CV.
The other way in
Engineering-to-physics transition
Engineers and applied mathematicians move into experimental or industrial physics roles — semiconductor R&D, optics, instrumentation — through on-the-job research experience, without ever completing a physics PhD.
Citizen science and independent research
Platforms like Zooniverse and LIGO's Einstein@Home let self-taught volunteers contribute real data analysis to active physics research, though independent researchers without institutional affiliation still rarely publish in the field's top journals.
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