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Physics (AS & A Level) · May / June 2021 · Paper 11 · Question 25

9702Electromagnetic spectrum

Microwaves in a vacuum travel at speed X and have wavelength of order of magnitude Y. What are the speed and a possible order of magnitude of wavelength of X-rays in a vacuum?

  1. Aspeed: X; wavelength: 10⁻⁸ Y
  2. Bspeed: X; wavelength: 10⁻⁴ Y
  3. Cspeed: 10⁴ X; wavelength: Y
  4. Dspeed: 10⁸ X; wavelength: Y

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Correct answer: A. speed: X; wavelength: 10⁻⁸ Y

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