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what does c mean in speed of light. In imperial units this speed is approximately 186282 miles per second. That breaks down to 186000 miles per second 300000 kilometers per second.
Its exact value is defined as 299 792 458 metres per second approximately 300 000 kms or 186 000 mis. The c stands for the speed of light a universal constant so the whole equation breaks down to this. In imperial units this speed is approximately 186282 miles per second.
The reason is that energy be it light waves or radiation travels at the speed of light.
The speed of light has been given the letter c. Light speed a constant called c is thought to be not achievable by anything. In 1894 Paul Drude modified the usage of Webers constant so that the letter c became the symbol for the speed of electrodynamic waves 3. A fundamental universal constant the speed at which light and all forms of electromagnetic radiation travel in a vacuum standardized as 1862824 miles per second 299792458 meters per second.