This deep dive covers What Are Electromagnetic Waves? within Electromagnetic Spectrum for GCSE Physics. Revise Electromagnetic Spectrum in Waves for GCSE Physics with 15 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 13 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 13
Practice
15 questions
Recall
15 flashcards
📡 What Are Electromagnetic Waves?
Electromagnetic (EM) waves are transverse waves consisting of oscillating electric and magnetic fields at right angles to each other and to the direction of travel. Unlike sound waves, they do not need particles to travel through — they can cross a complete vacuum. This is why sunlight can reach Earth across 150 million km of empty space.
The EM spectrum is a continuous spectrum — there are no sharp boundaries between types. The names (radio, microwave, infrared, etc.) are convenient labels for ranges that humans use differently, but the underlying wave is always the same kind of thing.