Cambridge IGCSE Combined Science practice

Paper 3 structured question: Electromagnetic spectrum

Try the question first, then check the answer and practise the same topic again.

At a glance

Paper

Marks

Topic

Electromagnetic spectrum

Exam-style question

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Paper 3Theory (Core)3 marks

Electromagnetic waves are used in various technologies such as communication and medical imaging.

Description

Electromagnetic waves travel at a constant speed in a vacuum and nearly the same speed in air.

a
Explain the significance of the speed of electromagnetic waves in communication technologies.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 3Theory (Core)2 marks

Description

Electromagnetic waves travel at different speeds in different media, with the highest speed in a vacuum.

a
Describe how the speed of electromagnetic waves changes when they move from a vacuum to air.
Your answer
Aim for approximately 2 distinct marking points.
[2]