What is the speed of light in a vacuum approximately?
A
3 x 10^5 m/s
B
3 x 10^6 m/s
C
3 x 10^10 m/s
D
3 x 10^8 m/s
Correct Answer: Option D — 3 x 10^8 m/s
Explanation:
Light travels at approximately 300,000 kilometers per second, or 3 x 10^8 meters per second, in a vacuum. This constant speed is fundamental to physics and forms the basis of Einstein's theory of relativity.