Photon
* All photons emitted by hydrogen have the same energy.
* All photons have half-integral spin
  - travel at the speed of light
* Every photon contains a small amount of energy
  - has a wavelength, l, and a frequency, n
* Some photons are part of beams
  - coronae
  - meteors
  - microwaves
  - moonlights
  - nimbuses
  - rays
  - starlights
  - sunlight
  - sunshine
  - yellow, others blue, red, ultraviolet, or even x-ray
  - behave more like a wave and others behave more like a particle
* act like particles
* also measure and define physical space.
* are angles of light that science defines as messenger particles
  - bosons, many photons can be in the same state
  - bundles of oscillating electric and magnetic fields
  - carriers of vibrancy, or vibration, throughout our universe
  - discrete packets of radiant energy that travel in waves
  - electrically neutral
* are electromagnetic radiation
  - waves with a particular frequency
  - electromegnetic waves
  - elementary particles
  - faster and more efficient than electrons, and they can even pass through one another
  - fundamental particles
  - light particles
  - located in space
  - massless and thus have a different little group
  - massless, so the momentum of a photon with energy is
  - much more penetrating than alpha and beta particles
  - one in time
  - packets of energy in the electromagnetic spectrum
  - part of electromagnetic radiation
  - particle-like features of light
* are particles , much smaller than atoms
  - of energy that can be absorbed into and emittted from atoms and molecules
  - that travel at the speed of light
  - produced by the transition of electrons downward in their orbits
  - self-sustaining, disc shaped, spinning, matter bodies moving at constant linear speed
  - small, so small they can apparently be absorbed by single electrons
* are the carrier particles of electromagnetic interactions
  - fastest of all spaceships
  - particles of light
  - their own antimatter counterpart
  - thus the ideal particles for transmitting information over long distances
  - to optical fibers what electrons are to copper wires
  - units of electromagnetic radiation including radio waves, light, and X-rays
* become particle pairs, and particle pairs make photons.
* begin to be visible.
* behave like waves or particles, depending on the experiment and observer.
* bounce off of elementary particles, much like billiard balls.
* can behave like both particles and waves
  - change into leptons, which can change into gluons, etc
  - collide with electrons, or even other photons
  - scatter off interstellar electrons, for example
* carry polarization like classical beams.
* climbing out of a gravitating object become less energetic.
* create a signal potential of subatomic information.
* differ from particles in that their energy is related to their wavenumber through.
* do have zero rest mass.
* emanated by the sun carry energy depending on the colour of the light.
* enter a channel and photoionize an atom in the wall
  - from the right through a collimator filled with the rare gas of interest
  - the ionization cell and collide with helium atoms
* escape, forming cosmic microwave background.
* fall under gravity.
* falling into the gravitational potential wells of clusters gain energy.
* fly near the atoms and are deflected.
* follow the curvature of space.
* go on splitting the nuclei, until only protons and neutrons remain.
* have Structure.
* have a set amount of energy - the energy is quantized
  - spin of one since they can be dipolar
  - wavelength , a velocity , a frequency , energy , and even a momentum
  - energy and momentum
  - momentum but no mass or electrical charge
* have no definite maximum range
  - electric charge
  - mass and no electrical charge
* have no mass or charge, and they travel in straight lines
  - but are electromagnetic, as are light, uv, and radio waves
  - rest mass and no time
  - orbital motion in a magnetic field and just spin as a singularity
  - properties of both waves and particles
  - the largest range of energy and central in a variety of energy conversions
  - zero mass
* hitting chlorophyll knock an electron to a higher energy level.
* imply that the electromagnetic spectrum stretches in several orders of magnitude.
* includes sections.
* interact very strongly with free electrons.
* interact with electric and magnetic entities
  - matter via absorption and re-emission
* is the term for the particles of light that provide the energy needed for photosynthesis.
* lose energy as they escape the gravitational field of a massive object.
* mediate electromagnetic interactions between particles in quantum electrodynamics.
* move in waves, which is why they're called light waves
* orbit the black hole at the distance of the photon sphere.
* play an important role in many measurement procedures.
* raise electrons into a higher orbit.
* striking a silicon surface create free electrons through the photoelectric effect.
* then pass out the tube in irregular directions, giving it a red glow.
* transport the energy.
* travel at a constant speed, which is entirely unchanged by the motion of any observer
  - slower speed inside a medium
* travel through medium without interaction until they undergo a chance encounter
  - space at the speed of light
* traveling at higher frequencies are therefore more energetic.
+ Electromagnetism, Electromagnetic radiation, Photons
  * Photons have energy and momentum. When two electromagnetic fields act on each other, they switch photons. So photons carry the electromagnetic force between charged objects. Photons are also known as messenger particles in physics because these particles often carry messages between objects. If a force exists while time passes, then photons are being exchanged during that time.
+ Gluon: Elementary particles
  * Gluons carry the strong force between other quarks, so it is considered a force carrying particle. Photons do the same thing, but for the electromagnetic force.
+ Photon, Properties: Basic physics ideas :: Electromagnetism :: Light :: Elementary particles
  * Photons are fundamental particles. Although they can be created and destroyed, their lifetime is infinite.
+ Quantum mechanics: Basic physics ideas :: Mechanics :: Mathematics :: Nuclear physics :: Quantum mechanics
  * Photons are particles, much smaller than atoms. The more photons a lamp shoots off, the brighter the light. Light is a form of energy that behaves like the waves in water or radio waves. Each photon carries a certain amount, or 'quantum', of energy depending on its wavelength.