What is the speed of light in kilometers per second?

Prepare for the Pre-IB Grade 9 Science Exam with detailed flashcards and multiple-choice questions. Each question is paired with hints and thorough explanations. Ace your test with confidence!

Multiple Choice

What is the speed of light in kilometers per second?

Explanation:
Light in a vacuum travels at a constant speed of about 300,000 kilometers every second. This value, often called c, is the same for all light sources and observer frames in empty space. We usually use the approximate 3 × 10^5 km/s for quick calculations, while the exact value is about 299,792 km/s. The other options don’t match this fundamental speed: they are either much slower or much faster than light in vacuum. Remember, in other materials, light slows down, but in empty space that universal speed is what we refer to as the speed of light.

Light in a vacuum travels at a constant speed of about 300,000 kilometers every second. This value, often called c, is the same for all light sources and observer frames in empty space. We usually use the approximate 3 × 10^5 km/s for quick calculations, while the exact value is about 299,792 km/s. The other options don’t match this fundamental speed: they are either much slower or much faster than light in vacuum. Remember, in other materials, light slows down, but in empty space that universal speed is what we refer to as the speed of light.

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