Microwave & infrared (Edexcel GCSE Physics): Quizzes
📚Quizzes
Practise the questions
13 questions from this quiz
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Practise the questions
13 questions from this quiz
Why are microwaves used in satellite communication?
Why are microwaves used in satellite communication?
They pass through Earth's atmosphere
Why do communication microwaves use different wavelengths than microwave ovens?
Why do communication microwaves use different wavelengths than microwave ovens?
To travel long distances unabsorbed
How far do microwaves penetrate into food in a microwave oven?
How far do microwaves penetrate into food in a microwave oven?
A few centimetres
What absorbs the microwaves inside food in a microwave oven?
What absorbs the microwaves inside food in a microwave oven?
Water molecules
How does food cook in a microwave oven?
How does food cook in a microwave oven?
From the inside
What is the relationship between an object's temperature and IR emission?
What is the relationship between an object's temperature and IR emission?
Hotter objects emit more IR
What do infrared cameras convert IR radiation into?
What do infrared cameras convert IR radiation into?
An electrical signal
How do police use thermal imaging?
How do police use thermal imaging?
To detect suspects in the dark
How do toasters use infrared radiation?
How do toasters use infrared radiation?
To heat and cook food
What does the wire in an electric heater emit when current flows through it?
What does the wire in an electric heater emit when current flows through it?
IR radiation and visible light
What is required for IR communication between devices?
What is required for IR communication between devices?
Receiver in line of sight
Why is only a single wavelength of IR used inside optical fibres?
Why is only a single wavelength of IR used inside optical fibres?
To prevent dispersion
How is data transferred through optical fibres?
How is data transferred through optical fibres?
Total internal reflection