Question
Question (1 mark): Which of the following is the speed of all electromagnetic waves in a vacuum?
A) 3 × 10⁵ m/s B) 3 × 10⁶ m/s C) 3 × 10⁸ m/s D) 3 × 10¹⁰ m/s
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.