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Electromagnetic spectrum

Electromagnetic spectrum

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Question 131

For each of the following applications, identify the correct region of the electromagnetic spectrum used.

a.

Detecting forged banknotes often involves shining a special lamp onto security markings to make them glow.

Which region of the electromagnetic spectrum is used? Select one box:

  • □\square□ radio waves
  • □\square□ microwaves
  • □\square□ infra-red
  • □\square□ ultra-violet
  • □\square□ gamma rays
[1]
b.

Firefighters use thermal imaging cameras to locate casualties through dense smoke.

Which region of the electromagnetic spectrum is detected by these cameras? Select one box:

  • □\square□ radio waves
  • □\square□ microwaves
  • □\square□ infra-red
  • □\square□ ultra-violet
  • □\square□ gamma rays
[1]
c.

Hospitals use highly energetic, penetrating radiation to sterilise medical instruments and kill bacteria.

Which region of the electromagnetic spectrum is used for this sterilisation? Select one box:

  • □\square□ radio waves
  • □\square□ microwaves
  • □\square□ infra-red
  • □\square□ ultra-violet
  • □\square□ gamma rays
[1]
d.

Wi-Fi routers and Bluetooth devices transmit data wirelessly over short distances to network devices.

Which region of the electromagnetic spectrum is used by these devices? Select one box:

  • □\square□ radio waves
  • □\square□ microwaves
  • □\square□ infra-red
  • □\square□ ultra-violet
  • □\square□ gamma rays
[1]
Markscheme

Electromagnetic spectrum Questions

  1. IGCSE
  2. /Physics
  3. /Electromagnetic spectrum

198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.

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