noun
definition
The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.
Examples of photons in a Sentence
A highly collimated beam of gamma-ray photons is made incident upon a detector crystal.
Fig 2. An outline of the merged beam experiment; D 1 and D 2 are calibrated detectors for photons and ions.
Since our atoms cannot absorb photons emitted by ethereal atoms, the ethereal atoms, the ethereal world is invisible to us.
The mystery is to explain how the photons ' co-operate ' to form the interference fringes.
This unit has optics which add together two of the dye laser photons, effectively doubling their frequency.
Bombardment with x-ray photons leads to the emission of electrons, these are called photoelectrons.
Instead, they absorb ultraviolet photons from hot stars which are near or embedded in the nebula.
On beamline 5D circularly polarized photons are selected by means of a defining aperture, or chopper.
The associated energy balance imposes an upper limit on the energy of the radiated photons, well below the TeV range.
Then like the entangled photons you simply recreate an exact replica of yourself from the surrounding matter!
Four incoming photons are required to complete the process.
Dissociation of virtual photons in events with a leading proton at HERA.
Photon torpedoes - what have explosive coffins got to do with photon torpedoes - what have explosive coffins got to do with photons?
Secondly, a spectrometer will measure the energies of incoming gamma-ray photons.
Each group will be given one day's collection of high-energy photons, which they will enter into a 6 X 5 matrix.
These mirrors were able to focus X-ray photons with energies in the range 0.1 - 10 KeV.
What begins as a single gamma ray photon in the sun's core emerges at the surface as thousands of visible-light photons.
The conversion of electron energy into X-ray photons is also more efficient with fast rather than slow electrons.
They are converted from gamma-ray / x-ray photons to Ultraviolet photons and then finally to visible photons when they reach the photosphere.
Furthermore, polarized electrons have been used to make polarized photons in the dilute magnet materials.
That substitution creates a vacancy similar to a hole in a p-type semiconductor, which emits single photons when excited by a laser.
Photon torpedoes - what have explosive coffins got to do with photons?
Cosmic radiation also keeps us alive - thanks to all those photons which make it through from the sun.
Like the Innsbruck teleportation scheme published several weeks earlier (Update 350), this demonstration employs a pair of entangled photons.
These frequency doubled photons are then added to another dye laser photon, effectively tripling their frequency.
This means that the photons in the light are all vibrating in one direction, instead of in random directions.
As individual photons (light) from a dimly lit room or night scene enter the goggles, they strike a photoelectric plate, which uses the "photoelectric effect" to convert those photons into electrons, or electricity.
The photocathode converts the few photons that strike it into a corresponding pattern of electrical energy called electrons.