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Physics (AS & A Level) · May / June 2016 · Paper 13 · Question 23

9702Electromagnetic spectrum

A beam of red laser light has length 1.0 m. What is the order of magnitude of the number of wavelengths of the red light in 1.0 m?

  1. A10^4
  2. B10^6
  3. C10^8
  4. D10^10

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Correct answer: B. 10^6

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