Physics - Senior Secondary 3 - Energy quantization

Term: 1^st Term

WEEK: 6

Class: Senior Secondary School 3
Age: 17 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Energy Quantization
Subtopics:

• Energy levels in atoms
• Ground state
• Excited state
• Emission of light energy on return to ground state (Atomic spectra)

SPECIFIC OBJECTIVES:

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

1. Understand the concept of energy levels in atoms.
2. Distinguish between the ground state and the excited state of an atom.
3. Explain how light energy is emitted when electrons return to the ground state.
4. Understand atomic spectra and its significance.

INSTRUCTIONAL TECHNIQUES:

• Explanation
• Demonstration
• Questions and answers
• Hands-on activity: Simulate energy levels and emission of light
• Video clips on atomic spectra

INSTRUCTIONAL MATERIALS:

• Energy level diagrams (Bohr model)
• Physics textbook
• Whiteboard markers
• Video clips on atomic spectra

INSTRUCTIONAL PROCEDURES

PERIOD 1-5

PRESENTATION

STEP 1: INTRODUCTION

• The teacher introduces the concept of energy quantization in atoms.
• Students discuss what happens to atoms when they absorb or emit energy.

STEP 2: EXPLANATION

• The teacher explains the concept of energy levels within an atom, focusing on the ground and excited states.
• Discuss how electrons move between energy levels when atoms absorb or emit energy.

STEP 3: DEMONSTRATION

• Show a video demonstrating how electrons move to higher energy levels and then return to the ground state, emitting light in the process.

STEP 4: ATOMIC SPECTRA

• The teacher explains atomic spectra and how different elements produce unique spectral lines when they emit light.
• Students will observe and record the emission spectra of different elements (e.g., hydrogen, sodium).

STEP 5: NOTE TAKING

• Teacher writes a summary of energy levels, ground and excited states, and atomic spectra on the board.

EVALUATION

1. What is energy quantization, and how does it apply to atoms?
2. Describe the difference between the ground state and the excited state of an atom.
3. What happens when an electron returns to the ground state?

CLASSWORK:

• Draw an energy level diagram for hydrogen, showing the ground state, excited state, and the transition of electrons.

CONCLUSION

• The teacher will review the students’ responses and provide feedback.
• Students are encouraged to reflect on the applications of atomic spectra in identifying elements.