Energy usually travel in a discrete quantities which are very indivisible, this quantity is known as Photons.
- A photon can be regarded as a smallest discrete quantum of electromagnetic radiation. It can be referred to as basic unit of all light.
- Photons are particles which are always in motion, they usually travel in vacuum at a speed of light.
- The photon are elementary particle with no mass and serve as quantum of the electromagnetic field as well as electromagnetic radiation such as light , Their velocity is [tex]2.998 x 10^8 m/s.[/tex]
Therefore, photon is an elementary particle.
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