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Physics · May / June 2018 · Paper 12 · Question 30

5054Electromagnetic spectrum

A television controller emits an infra-red beam. Which statement about infra-red radiation is correct?

  1. AIt causes ionisation.
  2. BIt consists of longitudinal waves.
  3. CIt has a higher frequency than ultra-violet light.
  4. DIt travels at the speed of light.

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Correct answer: D. It travels at the speed of light.

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