# What Are Photons?

Photons are bundles or elementary particles of electromagnetic energy. These particles are constantly in motion and they travel at a speed of 2.998 x 10^8 m/s. Photons are considered to be mass less and they have no rest energy.
Photons
The basic unit (quantum) of electromagnetic radiation (and therefore light), photons were first postulated by Planck, whose measurements of the blackbody spectrum showed that electromagnetic radiation... More »
The term photon refers to the quantum of electromagnetic energy, with discrete particle having zero mass, no electric charge, and with an indefinitely long lifetime. It exhibits deflection by a gravitational field, and can exert a force. The modern concept of the photon was developed gradually by Albert Einstein.
The term photon is used in physics to refer to a particle representing a quantum of light or any other electromagnetic radiation. This term is also defined as the unit for retinal illumination.
A Photon is a basic unit of light and all other forms of electromagnetic radiation. They are traditionally said to be mass less and act as one of the fundamental forces within the electromagnetic field. They were first identified in 1905 by Albert Einstein but the name photon was coined by chemist Gilbert Lewis in 1926.
Photon is an elementary particle. It is also the force carrier for the electromagnetic force. The effects of this force are easily observable at the microscope level.
Q&A Related to "What Are Photons"
 Photons are nothing but light waves. Photons is a word derived from Greek word. Photons means waves carrying photo that is light waves. http://answers.ask.com/Science/Physics/what_are_ph...
 A photon is what is known as an elementary particle, which means it cannot be divided into sub-components. It is also what is known as the quantum of the electromagnetic field. This http://www.ehow.com/how_4675599_do-photons-come.ht...
 A photon is a particle of electromagnetic radiation, for example a gamma ray, x-ray, light, etc. http://wiki.answers.com/Q/What+os+a+photon
 A photon has size but probably not in the rigid sense that we think about with macroscopic objects. Although photons exhibit properties of particles (and we know the size and mass http://www.quora.com/Physics/What-is-the-size-of-a...
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A photon is a quantum of light energy also called electromagnetic. Photon are on a constant move at a very high speed, also known as the speed of light. ...
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A photon is a fundamental particle of light (does not have any sub-particles). The photon is massless and has no electric charge. In empty space the photon travels ...