Waves · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.2.2.LI.2 - Classify sound into infrasonic, audio-sonic, and ultrasonic.

By the end of the lesson, learners can:

State the audible frequency range for a healthy human ear (20 Hz to 20,000 Hz).
Classify sound waves as infrasonic (below 20 Hz), audio-sonic (20 Hz to 20,000 Hz), or ultrasonic (above 20,000 Hz) given the frequency of any sound source.
Identify at least two uses of infrasonic and ultrasonic waves in real-world applications.
Estimate the frequency of a sound heard, such as a drumbeat, a bird call, or a school bell, and place it in the correct category.
Work collaboratively in mixed groups to use a frequency/signal generator to produce sounds at specific frequencies and classify them correctly.

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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.2 - Classify sound into infrasonic, audio-sonic, and ultrasonic.
Suggested placement: Semester 1, Week 18 (Week 18 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.
Curriculum reference: NaCCA curriculum document, p. 114

Exemplars (from the NaCCA curriculum)

Collaborative learning: Use a signal/frequency generator to help learners classify the frequencies of sound into infrasonic, audible and ultrasonic sound waves and their uses.
Provide equitable access to resources and opportunities.
Assessment (2.2.2.AS.2). 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