A photon is a sub atomic particle is a single enery packet of light As it has no mass it can travel at the speed of light (since it is light) and are created when an electron makes a quantum leap...
A particle of light. Or, in general, of an electromagnetic wave.
The photon is the carrier of electromagnetic energy.
Use the equations E=hf and v=fλ to get your answer
Of course ultra violet.
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