Learning objective

Recognize that the speed of electromagnetic waves in a vacuum is approximately 3.0 x 10^8 m/s, which is nearly the same in air.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

Cambridge IGCSE PhysicsSubject contentSupplement content

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Quick explanation

This point belongs to Electromagnetic spectrum, especially Electromagnetic spectrum outcomes.
You need to be able to recognize that the speed of electromagnetic waves in a vacuum is approximately 3.0 x 10^8 m/s, which is nearly the same in air.
The key ideas to know are Know and State.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

KnowState

Why it matters

This objective helps connect Electromagnetic spectrum outcomes to exam-style questions, flashcards, and revision notes for Electromagnetic spectrum.

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Flashcards10 linked cards

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Practice Questions7 linked questions

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Paper 4Theory (Extended)1 marks

Description

Electromagnetic waves travel at approximately 3.0 x 10^8 m/s in a vacuum and nearly the same in air.

a
State the speed of electromagnetic waves in a vacuum.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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