This is the electromagnetic spectrum.
answer: EMR
electromagnetic
Electromagnetic.
The photon is the force carrier of the Electro-magnetic spectrum hence any wave length in it is photons. From gamma rays to Radio waves all photons.
Electromagnetic spectrum.
Gamma-rays are the most energetic form of light and are produced by the hottest regions of the universe. They are also produced by such violent events as supernova explosions or the destruction of atoms, and by less dramatic events, such as the decay of radioactive material in space. Things like supernova explosions (the way massive stars die), neutron stars and pulsars, and black holes are all sources of celestial gamma-rays. A gamma ray is a packet of electromagnetic energy--a photon. Gamma photons are the most energetic photons in the electromagnetic spectrum. Gamma rays (gamma photons) are emitted from the nucleus of some unstable (radioactive) atoms. Gamma rays are an extremely high-energy form of electromagnetic (EM) radiation. Gamma ray radiation has a much, much shorter wavelength than visible light, so gamma ray photons have much, much higher energies than photons of light do. Gamma rays lie at the extreme high-energy end of the electromagnetic spectrum. X-rays, which have slightly lower energies than gamma rays, are the neighbors of gamma rays along the EM spectrum. In fact, the spectral ranges of hard X-rays and gamma rays overlap. Gamma rays have wavelengths of about 100 picometers (100 x 10-12 meters) or shorter, or energies per photon of at least around 10 keV. This type of electromagnetic wave oscillates with a frequency of 3 exahertz (EHz or 1018 hertz) or higher.
The EM spectrum, is based upon the emission of photons at different wavelengths. Visible light is a small part of this spectrum. As all of the spectrum travels at the speed of light - C. The frequencies for different wavelenghts of photons will be different. The creation of these different parts of the spectrum are from different oscillations (http://en.wikipedia.org/wiki/Electromagnetic_spectrum#Rationale) For instance radio waves come from the oscillation of electrons in an antenna. Limitations on these oscillations cause the limitation in the spectrum, at one end there is radiowaves, limited by electron oscillation and the at the other side is gamma from the creation of particle antiparticle pairs.
EMR
Electromagnetic.
Electromagnetic.
A homogenous beam contains photons of the same energy (monoenergetic)Because the photons all have the same energy, their interactions with materials (such as the absorber) are all the same resulting in uniform attenuation.Heterogenous beams contain photons of different energies.Because the photons have different energies, their interactions with materials (such as the absorber) are different resulting in non-uniform attenuation.
The photon is the force carrier of the Electro-magnetic spectrum hence any wave length in it is photons. From gamma rays to Radio waves all photons.
Electromagnetic radiation is simultaneously both waves and photons. The waves are perpendicular electrical waves and magnetic waves. Photons are massless particles. At lower frequencies/energies the waves are the easier to detect phenomenon, at higher frequencies/energies the photons are the easier to detect phenomenon, but it is always both all the time.
Electromagnetic spectrum.
They all share the same medium in which to project rays. Photons.
The Sun's 'rays' don't really have parts - it's all just light, which consists of photons. However, the photons emitted by the sun have a range of energies, and the different energies of the photons give rise to the different colours of light that we see. Red light, for example, corresponds to a lower energy than blue light. Apart from different energies, the photons are all exactly the same. The range of colours of visible light, part of the electromagnetic spectrum, is what we see in a rainbow. The fact that leaves are green means that they reflect green light, so plants are not good at absorbing green light. They are good at absorbing red light though, so a plant under a red lamp should grow better than a plant under a green lamp.
white
White light contains all of the colors in the visible spectrum. Black contains none of these colors.
The highest energy photons are all found at the "top" of the electromagnetic spectrum. That's the end populated by photons with the shortest wavelengths (and, therefore, the shortest periods) and the highest frequencies. These photons, these extremely energetic electromagnetic waves, are generated within the nuclei of atoms and released during nuclear events. Subatomic particles actually generate the photons as they go through changes. Stars (most of them) can produce photons in these energies continuously, or in bursts. We frequently refer to photons of extreme energies as gamma rays. We can stimulate nuclei to generate these high energy photons in the nuclear physics laboratory, and it's usually done with some sort of nuclear accelerator. We take protons - or whole atomic nuclei - and speed them up to near light speed and slam these nuclear bullets into targets (or other particles). Photons of the highest energies are produced. As one can imagine, shielding for containment is a big concern, as these energetic photons will punch through steel, concrete and earth. Some links are provided.