multiple - choice question\nwhat is a photon?\n a ray of light\n a ray of electron

Brief Explanations:

A photon is a fundamental particle of light, representing the quantum of electromagnetic radiation. It is not a ray of electron as electrons are different sub - atomic particles. A ray of light is a macroscopic concept, while a photon is a discrete quantum unit of light.

Answer:

Neither of the given options is correct. A photon is a quantum of electromagnetic radiation, a discrete packet of light energy.