Microwaves
4 marks · NormalMicrowaves are used in a variety of everyday applications.
State two uses of microwaves, other than for cooking food.
Explain why microwaves are suitable for the uses in part (a).
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(a) E.g. satellite communication, mobile phone signals, radar, wireless computer networks.
(b) Microwaves are suitable because they can easily pass through the atmosphere and materials like glass and brick, making them ideal for communication. They can also be directed and detected efficiently, which is important for radar.
Common mistakes: Including uses related only to cooking.; Not mentioning properties of microwaves.
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Marking points
B1 (a) · 1 mark · One correct use of microwaves (other than cooking).
B1 (a) · 1 mark · A second correct use of microwaves (other than cooking).
M1 (b) · 1 mark · States an appropriate property of microwaves (e.g., ability to pass through atmosphere/materials, directionality).
A1 (b) · 1 mark · Links the property to a use described in (a).
Worked solution
a) Uses: Satellite communication, mobile phone signals.
b) Explanation: Microwaves are suitable because they can pass through the Earth's atmosphere and materials like glass and brick, allowing signals to reach satellites or mobile phones indoors.