Question : The speed of light in a vacuum is:
Option 1: 399,792.458 km/s
Option 2: 499,792.458 km/s
Option 3: 199,792.458 km/s
Option 4: 299,792.458 km/s
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Correct Answer: 299,792.458 km/s
Solution : The correct option is 299,792.458 km/s .
The speed of light in a vacuum is approximately 299,792.458 kilometres per second (km/s) or about 186,282 miles per second (mi/s). This is often denoted by the symbol "c" in scientific equations and is a fundamental constant of nature.
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