Intro_EM_Waves_Nature,njbljh,jhljkjkb.pptx

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1. Introduction to Electromagnetic Waves Subtopic: Nature of Electromagnetic (EM) Waves Science 10 - Quarter 2

2. What are Electromagnetic Waves? • Electromagnetic (EM) waves are transverse waves. • They are made up of oscillating electric and magnetic fields. • These fields are perpendicular to each other and to the direction of travel. • They can travel even without a medium (in a vacuum).

3. Key Characteristics of EM Waves • Transverse in nature. • Transfer energy from one place to another. • Travel at the speed of light in a vacuum (3 × 10⁸ m/s). • Do not need air, water, or solid matter to propagate.

4. Electromagnetic vs. Mechanical Waves Electromagnetic Waves: – Travel without a medium. – Examples: light, radio, X-rays. Mechanical Waves: – Require a medium (solid, liquid, or gas). – Examples: sound, water waves, seismic waves.

5. Examples and Importance • Sunlight – provides energy for life on Earth. • Radio and TV signals – communication. • Medical imaging – X-rays. • Everyday gadgets – cellphones, Wi-Fi. EM waves are essential in science, technology, and daily living.