What is the speed of light in a vacuum?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

What is the speed of light in a vacuum?

Explanation:
Light travels at a constant speed in a vacuum, about 299,792 kilometers per second, which is roughly 186,282 miles per second. When you express this speed in miles per second, the commonly rounded value is 186,000 miles per second. That’s why the correct choice is the one in miles per second. The other options mix units or use incorrect time units (miles per minute) or give the same speed in kilometers per second, which isn’t the unit used in the question. In short, the speed of light in a vacuum is about 186,000 miles per second.

Light travels at a constant speed in a vacuum, about 299,792 kilometers per second, which is roughly 186,282 miles per second. When you express this speed in miles per second, the commonly rounded value is 186,000 miles per second. That’s why the correct choice is the one in miles per second. The other options mix units or use incorrect time units (miles per minute) or give the same speed in kilometers per second, which isn’t the unit used in the question. In short, the speed of light in a vacuum is about 186,000 miles per second.

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