Grade 10 Science: Electromagnetic Waves

Module Overview

• Quarter 2, Module 1
• Focus: Electromagnetic Waves
• Learning Competency: Compare relative wavelengths of different forms of electromagnetic waves

Lessons

1. The Nature of Electromagnetic Waves
2. Proponents of Electromagnetic Theory
3. Wavelengths and Frequencies of Electromagnetic Waves

Lesson 1: The Nature of Electromagnetic Waves

Objectives

1. Define electromagnetic waves.
2. Describe how EM waves are produced and propagated.
3. Explain properties of electromagnetic waves.

Pre-test

• Answer "agree" or "disagree" to the following statements:
  1. A wave is a disturbance that transfers energy.
  2. Electromagnetic waves transfer energy through a vacuum.
  3. A moving electric charge is surrounded by an electric field and a magnetic field.
  4. Most EM waves have the same speed.
  5. EM waves travel at the speed of 3x10^8 meters per second.

Key Questions

1. What are EM waves?

   • Defined as disturbances that transfer energy without transferring matter.
   • Examples include radio waves, visible light, and x-rays.
   • Do not require a medium to transfer energy.

2. How are EM waves produced?

   • Produced by oscillating charged particles (e.g., electrons).
   • Charged particles are surrounded by an electric field.
   • Oscillating charges produce magnetic fields.
   • Electric and magnetic fields propagate perpendicular to each other.

3. What are some properties of EM waves?

   • Do not require a medium for propagation.
   • Produced by accelerated or oscillating charges.
   • Travel in vacuum at 3x10^8 meters per second, which is the speed of light.
   • Speed is the ultimate limit; cannot be exceeded.
   • Can slow down when passing through materials like glass or water.

Reflection Log

• Question: How are EM waves important in everyday life?
  • Identify devices that emit or transmit EM waves.
  • Assess the importance of these devices.

Post-test

• Complete each statement with the correct concept:
  1. A wave is a disturbance that transfers energy without moving matter.
  2. A vacuum is an empty space or free space.
  3. Electromagnetic waves are created by oscillating charged particles.
  4. The electric field and magnetic field vibrate perpendicular / 90 degrees to each other.
  5. EM waves travel at the speed of 3x10^8 meters per second.

Conclusion

• Review of pre-test answers.
• Transition to Lesson 2: Proponents of Electromagnetic Theory.