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Physics · Oct / Nov 2024 · Paper 11 · Question 27

5054Electromagnetic spectrum

A student makes four statements about infrared waves. 1 They can be seen by the human eye. 2 They travel at 330 m / s in air. 3 They are transverse waves. 4 They are used by intruder alarms. Which statements are correct for infrared waves?

  1. A1 and 3
  2. B2, 3 and 4
  3. C2 only
  4. D3 and 4 only

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Correct answer: D. 3 and 4 only

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