Check out the development and replacement of the theory behind electromagnetic radiation.

Find out how physicist measure the energy of charged elementary particles.

Explore why electrons cannot coexist on the same energy state within an atom.

Find the types, behaviors, and discoveries of these elementary particles. Includes photos.

Learn about quantum chromodynamics, the branch of physics that studies quarks and gluons.

Find out about class of elementary particles that interact through the the strong nuclear force.

Briefly describes an elementary particle theory used to explain the existence of massive gauge bosons.

Offers an overview of the forces that hold molecules together.

Defines and describes this class of light-weight elementary particles.

Find out about this hypothetical elementary particle first proposed in the 1930s.

Find out about this mechanical component used to hold parts closely together.

Learn about the unique characteristics of electron, muon and tau neutrinos.

Check out an elementary particle, one of the constituents of ordinary matter, made up of quarks.

Provides an introductory overview of the devices used to add energy to charged particles. Follow links to related full length articles.

Concise encyclopedia article describes various particle detecting devices, or devices used to study fundamental particles.

Learn about this instrument used by physicists to trap individual particles and atoms using electromagnetic fields.

Browse a scientific definition of this term used to identify quantum units of vibrational energy. Include links to related Web resources.

Read a basic definition and browse links to articles about the quantum of light energy known as the photon.

Discusses the size, behavior and role of the proton in the composition of the atom.

Supplies a definition of a particle which is theorized to be one of matter's fundamental building blocks.

Encyclopedia article elucidates a variety of motion exhibited by all sub-atomic particles.