Mechanics, motions of objects Quantum Theory, describing interactions of particles and energy Thermodynamics, description of systems of matter and energy A Brief Introduction to Particle Physics Albert Einstein, prominent 20th century physicist doing a science experiment for school doing a science fair project for school Q & A About Physics Stephen William Hawking, contemporary physicist Thematic Essay: Physics, from Leonardo to Hertz all articles about physics Antimatter Atoms Created for the First Time applications astrophysics atomic and molecular physics biophysics branches of physics classical (Newtonian) and pre-classical physics condensed-matter (solid-state) physics constants cosmology definition and scope of study devices and tools electromagnetism elementary particles main article overview alpha, beta, and gamma particles antimatter antimatter – Chamberlain, Owen antimatter – Cronin, James Watson antimatter – Fitch, Val Logsdon antiparticles antiproton atomic nucleus, particles in bubble chamber charged particles in electrical fields Cherenkov effect cloud chamber, invention of conservation law, violation of conservation of energy and momentum Cooper pairs development of holography devices for detecting particles discovery of J/psi particle discovery of leptons discovery of muon discovery of neutrino discovery of neutron discovery of positron discovery of quarks electron microscope electron physics electrons, arrangement in atom electrons, diffraction of electrons, discovery of electrons, energy level of electrons, magnetic moment of electrons, orbit paths of electrons, spectral lines of force fields affecting particles interactions of elementary particles liquid hydrogen bubble chamber meson motion of charged particles neutrino mass neutron scattering technique particle accelerators particle accelerators – Cockcroft, Sir John Douglas particle accelerators – Walton, Ernest Thomas Sinton particle detector particle trap particle trap – Chu, Steven particle trap – Cohen-Tannoudji, Claude particle trap – Philips, William D. Penning trap quark-parton theory, revisions of quarks radioactivity, creation of artificial Richardson’s law size and shape of positron and neutron subatomic particles subatomic particles – Rubbia, Carlo superstring theory symmetry toward unified theory transformation of proton into positron and electron W and Z field particles, existence of X rays, discovery of equations and formulas fundamental forces of nature geophysics laws of motion modern physics nuclear physics pictures, diagrams, and illustrations quantum theory quotations researchers and their work Sir Isaac Newton, physicist of the 17th and 18th centuries theoretical physics thermodynamics variables wave phenomena