Waves · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.2.2.LI.4 - Apply the concept of resonance in the determination of speed of sound in air.

By the end of the lesson, learners can:

Define resonance and explain the conditions required for resonance to occur in a resonance tube.
Describe the procedure for determining the speed of sound in air using a resonance tube apparatus.
Apply the resonance tube equations (v = 4fL₁ and v = 2f(L₂ - L₁)) to calculate the speed of sound in air.
Compare the experimentally determined value of the speed of sound with the accepted value of approximately 343 m/s and account for any differences.
Identify real-life examples of resonance and explain how understanding resonance helps in practical situations.

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Curriculum details

Strand: Energy (Strand 2)
Sub-strand: Waves (2.2)
Content standard: 2.2.2.CS.2 - Demonstrate knowledge and understanding of sound waves. 2.2.2.LO.2 Using the property of reflection of sound and the phenomenon of resonance to give an account of how the speed of sound can be determined.
Indicator: 2.2.2.LI.4 - Apply the concept of resonance in the determination of speed of sound in air.
Suggested placement: Semester 1, Week 19 (Week 19 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

exemplars - p.115: the document prints this assessment code as 2.2.2.AS.5 beside learning indicator 2.2.2.LI.4
Curriculum reference: NaCCA curriculum document, p. 115

Exemplars (from the NaCCA curriculum)

Experiential learning: Set up an experiment to determine to speed of sound in air using resonance (resonance tube/sonometer).
Foster an inclusive and respectful classroom culture and address bias in teaching materials and examples.
Assessment (2.2.2.AS.5). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive laboratory virtual
- Slinky
- Sonometer
- Guitar, piano
- Frequency/signal generator
- Resonance tube set up