Sound — Waves, Vibration, and Pitch

Sound is air vibrating. A tuning fork struck sends waves; the ear interprets them as pitch. Indirect aim: wave physics, music theory, preparation for the electromagnetic spectrum.

• Framework: Montessori
• Unit: Cultural Studies
• Learning area: Physical Science
• Level: Ages 8-10

Objectives

• Understand sound as wave produced by vibration
• Relate frequency to pitch
• Relate amplitude to loudness
• Measure wavelength

Materials

• Tuning forks of various pitches
• Rubber bands on open box
• Oscilloscope or app
• Paper and pen for wave drawings

Instructions

1. Strike a tuning fork; touch water — ripples show vibration. 2. Pluck a rubber band; tight = high pitch, loose = low. 3. Frequency: waves per second, measured in Hz. 4. Amplitude: wave height = loudness. 5. Use oscilloscope app to see the wave. 6. Compare two tuning forks of different pitches. 7. Study human hearing range (20-20,000 Hz). 8. Research one instrument family (strings, brass, percussion).

Educator tip

A tuning fork in water is magical — children see what they hear. Don't skip this.

Assessment

Observe understanding of frequency, amplitude, and wave-pitch relation.

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