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Physics (AS & A Level) · May / June 2024 · Paper 11 · Question 25

9702Electromagnetic spectrum

An electromagnetic wave is travelling through a vacuum. What could be the wavelength and period of the electromagnetic wave?

  1. Awavelength 1.2 × 10⁻¹⁰ Tm, period 2.5 Ms
  2. Bwavelength 1.2 pm, period 2.5 × 10¹¹ Gs
  3. Cwavelength 1.2 × 10² pm, period 4.0 × 10⁻¹⁰ ns
  4. Dwavelength 1.2 × 10³ μm, period 4.0 ns

As printed in the paper

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Correct answer: C. wavelength 1.2 × 10² pm, period 4.0 × 10⁻¹⁰ ns

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