Light & Sound — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A tight string makes a high pitch sound.
Tight strings shake very fast, and fast vibrations make a high pitch sound.
2. A loose string makes a low pitch sound.
Loose strings shake more slowly, and slow vibrations give a low pitch sound.
3. A short string gives a higher pitch than a long one.
Short strings vibrate faster than long strings, so they sound higher.
4. A big bass drum makes a very low pitch sound.
Large drum tops vibrate slowly, which creates a deep low pitch sound.
5. A tiny bell makes a high pitch sound.
Small bells vibrate very fast, so we hear them as a high ringing pitch.
6. How fast something vibrates controls the pitch.
Pitch only changes when the speed of the vibrations speeds up or slows down.
7. A flute plays a higher pitch than a tuba.
The flute uses short fast air vibrations, while a tuba uses long slow ones.
8. A stretched rubber band snapped tight sounds high.
Stretching a rubber band tight makes it vibrate faster, raising the pitch.
9. Pitch is not the same as volume.
Pitch tells high or low, while volume tells how loud or soft a sound is.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Small flute
→ High pitch flow
High pitch flow
Big tuba
→ Low pitch boom
Low pitch boom
Tight guitar string
→ High pitch twang
High pitch twang
Large bass drum
→ Low pitch thump
Low pitch thump
Each instrument vibrates at a different speed, which sets its high or low pitch.