Usage Examples
Filter by Meaning The speed of light is defined as the speed of a photon in a vacuum.
A photon can travel faster than other particles in some materials.
The speed of light in a vacuum is the maximum speed at which a particle, such as a photon, can travel.
The process of pair production involves the collision of a high-energy photon with a nucleus, creating an electron and a positron.
The properties of a photon can change when it travels through a medium.
When a photon enters a medium, it slows down and changes direction.
The photon is believed to be the carrier of the gravitational force.
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