Unit 4: Sound

How sound travels through materials, loud and quiet sounds, muffling, and high and low pitch on instruments.

• 4.1 Sound travels through materials – Sound needs something to travel through.
• 4.2 Sound travels through different materials – Put your ear to the table – sound travels through solids too.
• 4.3 How sound travels – Sound spreads out in waves, like ripples on a pond.
• 4.4 Loud and soft sounds – Bigger vibrations make louder sounds.
• 4.5 Sound volume – Measure loudness in decibels.
• 4.6 Muffling sounds – Soft materials soak up sound.
• 4.7 High and low sounds – Fast vibrations make high sounds.
• 4.8 Pitch on percussion instruments – Tighter, smaller and shorter make higher notes.
• 4.9 Having fun with wind instruments – Vibrating air makes music.