Physics - Senior Secondary 3 - Duality of matter

Term: 1^st Term

WEEK: 8
Class: Senior Secondary School 3
Age: 17 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Duality of Matter
Subtopics:

• Wave nature of matter:
• Electron diffraction
• Particle nature of matter:
• Photoelectric effect
• Compton effect
• The uncertainty principle

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

1. Explain the wave nature of matter using electron diffraction.
2. Describe the particle nature of matter with reference to the photoelectric and Compton effects.
3. Understand and explain the uncertainty principle.

INSTRUCTIONAL TECHNIQUES:

• Explanation
• Demonstration
• Discussions using illustrations
• Video clips on electron diffraction and the Compton effect

INSTRUCTIONAL MATERIALS:

• Electron diffraction apparatus (if available)
• Physics textbook
• Whiteboard markers
• Projector and videos on electron diffraction, the photoelectric effect, and the Compton effect

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

PRESENTATION

STEP 1: INTRODUCTION

• Teacher asks students to share their understanding of matter and light, particularly the wave-particle duality.
• The teacher introduces the concept of wave-particle duality.

STEP 2: EXPLANATION

• The teacher explains the wave nature of matter using electron diffraction.
• Explanation of the photoelectric effect and the Compton effect, highlighting their support for the particle nature of matter.
• Introduction to Heisenberg’s uncertainty principle and its implications for physics:
• It states that it is impossible to precisely measure both the position and momentum of a particle at the same time.

STEP 3: DEMONSTRATION

• The teacher demonstrates electron diffraction, showing how electrons can exhibit wave-like behavior.
• Teacher shows videos demonstrating the Compton effect, and discusses its significance in supporting the particle nature of light.

STEP 4: NOTE TAKING

• The teacher writes a summary note on the board, which students will copy.

NOTE

• Wave Nature of Matter: Matter exhibits wave-like properties, demonstrated through electron diffraction.
• Particle Nature of Matter: Evidence through the photoelectric and Compton effects.
• The Uncertainty Principle: It is impossible to simultaneously measure the position and momentum of a particle with absolute precision.

EVALUATION

1. What evidence supports the wave nature of matter?
2. Explain the photoelectric effect and the Compton effect.
3. What is Heisenberg’s uncertainty principle?

CLASSWORK:

• Discuss the implications of the uncertainty principle on our understanding of the behavior of subatomic particles.

CONCLUSION:

Teacher summarizes the key points and encourages students to reflect on the dual nature of matter in understanding modern physics.