What is the approximate speed of light in vacuum?

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Multiple Choice

What is the approximate speed of light in vacuum?

Explanation:
Light travels through a vacuum at a universal speed, the speed at which all electromagnetic waves propagate in empty space. This value is exactly 299,792 kilometers per second, so it’s common to see it rounded to about 3.0 × 10^5 km/s or 300,000 km/s. That’s why the option with 299,792 km/s is the best: it matches the precise figure for light in a vacuum. The other numbers are far too small to be the speed of light, even in ordinary media, so they don’t fit. In physics this speed is often denoted by c and is a foundational constant in many equations.

Light travels through a vacuum at a universal speed, the speed at which all electromagnetic waves propagate in empty space. This value is exactly 299,792 kilometers per second, so it’s common to see it rounded to about 3.0 × 10^5 km/s or 300,000 km/s. That’s why the option with 299,792 km/s is the best: it matches the precise figure for light in a vacuum. The other numbers are far too small to be the speed of light, even in ordinary media, so they don’t fit. In physics this speed is often denoted by c and is a foundational constant in many equations.

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