1. A student is playing a guitar. Some of the strings vibrate more quickly
than the others. The faster vibrating strings make
a. louder sound
b. lower sound
C. softer sound
d. harder sound
2. Why does a trumpet produce sound when it is blown?
a. The trumpet heats the air.
b. The air in the trumpet is cooled.
c. There is vibration in the air column inside the trumpet
d. There is a cooled air inside the trumpet.
3. Why is your eardrum compared to a drum?
a. It produces sound.
b. It is hollow.
c. It vibrates.
d. It reflects sounds.​