What is the approximate speed of light in kilometer per second?"
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That is the approximate speed of electromagnetic radiation (usually referred to as light) in a vacuum.
1.86 x 10^5 miles per second (approximate)
The speed of light is 186,000 miles per second in a vacuum.
The speed of air at 20 degrees Celsius is 343 meters per second. The speed of light is 299 792 458 meters per second.
That is the speed of light.That is the speed of light.That is the speed of light.That is the speed of light.