Exam-style question
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What is the relationship between the speed of light and electromagnetic waves?.
- A.The speed of light is constant in a vacuum and is the speed of electromagnetic waves.
- B.Electromagnetic waves travel faster than light.
- C.The speed of light varies with frequency.
- D.Electromagnetic waves cannot travel faster than sound.
Model answer
What a good answer should say
- The speed of light is constant in a vacuum and is the speed of electromagnetic waves.
Explanation
Why this works
Electromagnetic waves travel at the speed of light in a vacuum, which is approximately 3 x 10^8 m/s. This constant speed is a fundamental property of electromagnetic radiation.
Common mistake
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