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 independent of the frequency of the wave.
- B.The speed of light varies with the wavelength of the electromagnetic wave.
- C.The speed of light is slower in a vacuum than in any medium.
- D.The speed of light is determined by the amplitude of the electromagnetic wave.
Model answer
What a good answer should say
- The speed of light is constant in a vacuum and is independent of the frequency of the wave.
Explanation
Why this works
This statement is correct because electromagnetic waves travel at a constant speed (approximately 3 x 10^8 m/s) in a vacuum, regardless of their frequency or wavelength, which is a fundamental principle of electromagnetic wave theory.
Common mistake
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