26. SOUND
26.1 The Origin of Sound
26.2 Sound in Air
26.3 Media That Transmit Sound
26.4 Speed of Sound
- Describe the characteristics and formation of sound waves
26.7 Natural Frequency
26.8 Resonance
- Understand the concept of natural frequency and how resonance occurs
26.9 Interference
26.10 Beats
- Understand how interference occurs when two sound waves meet
- Describe the formation of beats
