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Question 3

This question is about waves in the electromagnetic spectrum.

a.

The table below shows the regions of the electromagnetic spectrum ordered from lowest frequency to highest frequency, with two regions labeled X and Y currently missing.

radio wavesmicrowavesXvisible lightultravioletYgamma rays \begin{array}{|c|c|c|c|c|c|c|} \hline \text{radio waves} & \text{microwaves} & \mathbf{X} & \text{visible light} & \text{ultraviolet} & \mathbf{Y} & \text{gamma rays} \\ \hline \end{array} radio waves​microwaves​X​visible light​ultraviolet​Y​gamma rays​​

Identify the missing regions X and Y.

[2]
b.

Which electromagnetic radiation is widely used in thermal imaging cameras to detect heat signatures and in optical fibre communications?

  • A ultraviolet
  • B infrared
  • C microwaves
  • D gamma rays
[1]
c.

Which electromagnetic radiation is utilized in satellite communications (such as GPS) and radar systems?

  • A radio waves
  • B microwaves
  • C infrared
  • D X-rays
[1]
d.

The sequence of electromagnetic waves from radio waves to gamma rays is in order of:

  • A decreasing frequency
  • B increasing speed in a vacuum
  • C increasing frequency
  • D increasing wavelength
[1]
e.

Excessive exposure to certain types of electromagnetic radiation can be hazardous to human health.

For two different types of electromagnetic radiation, describe:

  • a harmful effect on the human body,
  • how the risk of exposure can be reduced.
[4]
Markscheme

Waves Questions

  1. IGCSE
  2. /Physics
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