Physics - Senior Secondary 2 - Electromagnetic waves

Electromagnetic waves

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TERM: 2ND TERM

WEEK: 5

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Electromagnetic Waves
Subtopics:
• Electromagnetic spectrum

SPECIFIC OBJECTIVES:
By the end of the lesson, students should be able to:

  1. Define electromagnetic waves and their properties.
  2. List and explain the different types of radiation in the electromagnetic spectrum.
  3. Discuss the uses of various electromagnetic waves in real life.

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Visual aids (charts and diagrams)
• Interactive discussion

INSTRUCTIONAL MATERIALS:
• Electromagnetic spectrum chart
• Physics textbook
• Whiteboard markers
• Video on the electromagnetic spectrum

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

PRESENTATION
STEP 1: INTRODUCTION
• The teacher will introduce the concept of electromagnetic waves and explain their importance in everyday life.
• Students will share their knowledge of electromagnetic waves and their uses.

STEP 2: EXPLANATION
• The teacher explains the electromagnetic spectrum and its components:

  • Radio waves
  • Microwaves
  • Infrared radiation
  • Visible light
  • Ultraviolet radiation
  • X-rays
  • Gamma rays

STEP 3: DEMONSTRATION
• The teacher will demonstrate how electromagnetic waves travel through different media.
• Students will watch a video on the properties and uses of different types of electromagnetic radiation.

STEP 4: DISCUSSION
• Students will discuss the various uses of electromagnetic radiation, such as in communication, medicine, and security.

STEP 5: NOTE TAKING
• The teacher will write a summary of the electromagnetic spectrum on the board.

NOTE
• Electromagnetic waves do not require a medium to propagate; they can travel through a vacuum.
• The speed of electromagnetic waves in a vacuum is 3 × 10^8 m/s (speed of light).
• The electromagnetic spectrum is ordered by wavelength and frequency, with radio waves having the longest wavelength and gamma rays having the shortest wavelength.

EVALUATION

  1. List the different types of radiation in the electromagnetic spectrum.
  2. What is the speed of light?
  3. What is the practical use of X-rays?

CLASSWORK:
• Students will research and present one real-world application of electromagnetic waves in medicine, communication, or entertainment.

CONCLUSION:
• Review the key points of the electromagnetic spectrum.
• Encourage students to reflect on how understanding these waves impacts various industries.