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Physics (AS & A Level) · May / June 2021 · Paper 12 · Question 21

9702Electromagnetic spectrum

Two lasers emit light in a vacuum. One laser emits red light and the other emits green light. Which property of the light from the two lasers must be different?

  1. Aamplitude
  2. Bfrequency
  3. Cintensity
  4. Dspeed

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Correct answer: B. frequency

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