The speed of light in vacuum is approximately how many kilometers per second?

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Multiple Choice

The speed of light in vacuum is approximately how many kilometers per second?

Explanation:
Light in vacuum moves at a fixed speed, often denoted as c. That speed is about 299,792 kilometers per second; in exact terms, c equals 299,792,458 meters per second, which is 299,792.458 kilometers per second. Rounding to the nearest kilometer gives roughly 299,792 km/s, matching the option. The other numbers are clearly too small for light’s speed in vacuum (e.g., 150,000 km/s is about half of c, while 1,000 or 3,000 km/s are thousands of times slower). In many problems we use the approximate value of 3.00 × 10^5 km/s for quick estimates, but the precise figure is about 299,792.458 km/s.

Light in vacuum moves at a fixed speed, often denoted as c. That speed is about 299,792 kilometers per second; in exact terms, c equals 299,792,458 meters per second, which is 299,792.458 kilometers per second. Rounding to the nearest kilometer gives roughly 299,792 km/s, matching the option. The other numbers are clearly too small for light’s speed in vacuum (e.g., 150,000 km/s is about half of c, while 1,000 or 3,000 km/s are thousands of times slower). In many problems we use the approximate value of 3.00 × 10^5 km/s for quick estimates, but the precise figure is about 299,792.458 km/s.

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