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# Speed of Light

## Light is the fastest thing in the universe and always has the same speed in a vacuum.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Speed of Light

Students will gain an understanding of the speed of light and work problems involving light. The distance of a light year is also explained and practiced.
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• Interactive Simulations

## Least Time

Understand why a ray of light passes from one point to another in such a way that the time taken is a minimum which indeed results in the law of refraction.
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• PLIX

## Scientific Notation: Light Years to the Centaurus Constellation

Speed of Light Interactive
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• Video

## The Speed of Light

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## Speed of Light Quiz - PPB

Calculate distances in meters and in light years using the speed of light, understand the concept of light years.
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• Critical Thinking

## Speed of Light Discussion Questions

A list of student-submitted discussion questions for Speed of Light.
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• Study Guide