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299,792,458 meters (186,282 miles) per second, in vacuum.

Something less in any material medium, depending on the specific medium.

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14y ago

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What is the opposite of a photon?

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What does the term photon refer to?

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What is the term forThis is an elementary mass-less particle and is the basic unit of light and all other forms of electromagnetic radiation.?

Sounds like you are describing a photon.


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Yes, in a vacuum, all types of electromagnetic radiation (including light) travel at the speed of light, which is approximately 299,792 kilometers per second. This speed is a fundamental constant in physics and does not change based on the wavelength or frequency of the radiation.


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