Exam-style question
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Describe how the speed of light can be derived from electromagnetic wave theory.
Model answer
What a good answer should say
- The speed of light (c) can be derived from the equation c = f × λ, where f is the frequency and λ is the wavelength of the electromagnetic wave.
- In a vacuum, this relationship shows that light travels at a constant speed regardless of its frequency or wavelength.
Explanation
Why this works
This answer is strong as it provides the formula and explains the relationship between frequency and wavelength in determining the speed of light. The question assesses the student's ability to apply electromagnetic wave theory to derive a fundamental constant.
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