Microwave & infrared (Edexcel GCSE Physics Combined Science): 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 without absorption
What do microwaves heat directly inside food in a microwave oven?
What do microwaves heat directly inside food in a microwave oven?
Water molecules
How far do microwaves penetrate into food?
How far do microwaves penetrate into food?
A few centimetres
How does microwave cooking work?
How does microwave cooking work?
Water molecules heat up, cooking from inside
What is the relationship between an object's temperature and infrared radiation?
What is the relationship between an object's temperature and infrared radiation?
Hotter objects emit more IR radiation
How do infrared cameras create thermal images?
How do infrared cameras create thermal images?
Convert IR to electrical signal
What is a use of infrared cameras in security?
What is a use of infrared cameras in security?
Detect suspects in the dark
What does an electric heater wire emit when electric current flows through it?
What does an electric heater wire emit when electric current flows through it?
IR radiation and visible light
What is a limitation of infrared communication between devices?
What is a limitation of infrared communication between devices?
Works only over short distances
What are optical fibres made from?
What are optical fibres made from?
Thin strands of glass or plastic
Why is only a single wavelength of IR used in optical fibres?
Why is only a single wavelength of IR used in optical fibres?
To prevent dispersion and information loss
How does data travel through optical fibres?
How does data travel through optical fibres?
Through total internal reflection