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The 121 pages that link to Photon, each with the reason it gives.

• SpectroscopyRelated: Photon energy determines which transitions radiation can induce or detect.

• ElectronCompared with: Unlike the electron, it is neutral and massless, and mediates electromagnetism.

• Electromagnetic spectrumRelated: Photon energy rises across the spectrum as frequency increases.

• Electromagnetic radiationRelated: Photon energy provides the particle description of radiation and depends on its frequency.

• Quantum electrodynamicsRelated: QED treats electromagnetic radiation and interactions in terms of photon-field quanta.

• FluorescenceNarrower topic: Absorption and emission occur through interactions involving individual photons.

• Photoelectric effectNarrower topic: Einstein explained the effect by treating light as discrete energy-carrying quanta.

• LaserNarrower topic: Stimulated emission adds photons with the same frequency and direction as the triggering photon.

• Big Bang nucleosynthesisRelated: Energetic photons destroyed newly formed deuterium until the universe cooled sufficiently.

• Spectral lineRelated: A photon emitted or absorbed in a transition carries the line's energy.

• Speed of lightRelated: In vacuum, photons propagate at the invariant speed associated with light.

• Thermal radiationRelated: A quantum description treats thermal radiation as a population of photons.

• Black-body radiationBroader topic: Planck's spectrum can be understood through quantized photons occupying thermal modes.

• Visible spectrumRelated: Visible light can be described as photons whose energies correspond to visible wavelengths.

• MomentumCompared with: Photons carry momentum despite having no rest mass.

• Bohr modelRelated: The model describes spectral emission and absorption as photon exchange during transitions.

• Planck's lawRelated: Planck's quantized energy elements correspond to photons in the quantum account of radiation.

• Electroweak interactionBroader topic: It is the surviving massless gauge field after electroweak symmetry breaking.

• PhononCompared with: Unlike photons, phonons are quasiparticles tied to vibrations in a material.

• Absorption spectrumRelated: Absorption occurs when a photon supplies energy allowed by the absorbing substance.

• Compton scatteringNarrower topic: Compton’s explanation treated X-rays as particles with quantized energy and momentum.

• Cosmological redshiftBroader topic: Its wavelength changes during cosmic expansion even as it travels freely through space.

• GluonCompared with: Unlike gluons, photons carry no electric charge and do not directly interact with one another.

• PhotochemistryNarrower topic: Its energy sets which molecular transitions can be initiated by light.

• X-rayNarrower topic: An X-ray is one photon in the high-energy part of the spectrum.

• Pair productionRelated: Photons provide the energy in the best-known pair-production mechanisms.

• ChromophoreNarrower topic: A chromophore absorbs light by taking up photons with suitable energies.

• Electromagnetic fieldCompared with: The photon is the field's quantum description, unlike its classical continuous-field account.

• Color chargeCompared with: Unlike photons, gluons themselves carry the charge of the force they mediate.

• Mass–energy equivalenceRelated: Photons carry energy despite having no rest mass, showing that energy is not limited to massive objects.

• PhotoluminescenceNarrower topic: Photons provide the excitation energy and are released during radiative emission.

• Stimulated emissionNarrower topic: The incoming photon triggers the transition, and the emitted photon joins the radiation field.

• Absorption spectroscopyRelated: Absorption occurs when matter takes up photons with suitable energies.

• PhotoionizationNarrower topic: Absorbing a photon provides the energy that can remove a bound electron.

• Atomic spectrumRelated: An atomic transition emits or absorbs a photon whose energy matches the level spacing.

• BosonBroader topic: Photons are bosons whose occupation of optical modes enables laser light.

• UltravioletRelated: Ultraviolet photons carry more energy than visible-light photons.

• Wave–particle dualityBroader topic: Photons produce discrete detection events while also forming interference patterns.

• Gravitational redshiftBroader topic: A photon’s energy is proportional to its frequency, which observers measure differently across gravitational potentials.

• W and Z bosonsCompared with: Unlike W and Z bosons, it is massless and mediates a long-range force.

• GravitonCompared with: Its established detection contrasts with the graviton’s hypothetical status and proposed spin 2.

• Atomic spectroscopyRelated: Absorption and emission lines correspond to photons with specific energies.

• BremsstrahlungRelated: Each bremsstrahlung emission transfers energy and momentum in a photon.

• PhotolysisNarrower topic: A photolysis event begins when a molecule absorbs a photon's energy.

• PionCompared with: Photons are fundamental force carriers; pions are massive composite particles.

• Emission spectrumRelated: Emission processes produce photons whose energies determine spectral positions.

• Spin–statistics theoremBroader topic: Its bosonic statistics allow many photons to occupy the same optical mode.

• AntiparticleCompared with: A photon is its own antiparticle, unlike an electron and positron.

• Atomic emission spectrumRelated: The energy of each emitted photon matches the gap between the atom's states.

• Latent imageRelated: Absorbed photons provide the energy that initiates photographic exposure.