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Physics (AS & A Level) · May / June 2021 · Paper 12 · Question 25

9702Electromagnetic spectrum

Which list shows electromagnetic waves in order of decreasing frequency?

  1. Agamma-rays → infrared → ultraviolet → radio waves
  2. Bgamma-rays → ultraviolet → infrared → radio waves
  3. Cradio waves → infrared → ultraviolet → gamma-rays
  4. Dradio waves → ultraviolet → infrared → gamma-rays

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Correct answer: B. gamma-rays → ultraviolet → infrared → radio waves

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