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Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 25

9702Electromagnetic spectrum

Infrared laser light is used for the transmission of data along optic fibres. What is a typical wavelength of infrared radiation?

  1. A5 × 10⁻⁵ m
  2. B5 × 10⁻⁷ m
  3. C2 × 10⁻⁹ m
  4. D2 × 10⁻¹¹ m

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Correct answer: A. 5 × 10⁻⁵ m

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