Waves: Light and Sound — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. In Grade 4 music science, a shorter guitar string makes a higher pitch than a longer one.
Faster vibrations create a higher pitch.
2. Grade 4: a big drum with a wide head usually makes a lower pitched sound.
Slower vibrations produce a lower pitch.
3. How fast a string vibrates each second is called its frequency in Grade 4 science.
Frequency tells us how high or low a pitch sounds.
4. A flute is a woodwind instrument that makes sound when air vibrates inside its tube in Grade 4.
Woodwinds use vibrating air columns to create pitch.
5. Grade 4: tightening a guitar string makes the pitch go up.
Higher tension increases frequency and raises pitch.
6. The loudness of a sound wave is called its volume in Grade 4 science.
Volume depends on how big the wave's vibration is.
7. When sound moves from the instrument to your ear, scientists call it transmission in Grade 4 class.
Transmission describes the wave traveling through air.
8. A long pipe organ tube usually plays a lower note than a short tube in Grade 4 music.
Longer columns of air create lower frequencies.
9. Grade 4 students learn that pitch depends on the speed of the vibration.
Faster vibration speed means a higher pitch.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Grade 4: short guitar string
→ Higher pitch
Higher pitch
Grade 4: big bass drum
→ Lower pitch
Lower pitch
Grade 4: flute
→ Vibrating air column
Vibrating air column
Grade 4: tighter string
→ Pitch goes up
Pitch goes up
Pitch depends on size, length, and tension of the vibrating part.