Sound

which of the following would NOT produce a sound

• humming a song in the hallway
• plucking a guitar string underwater
• Knocking a fist against a wooden wall
• snapping your fingers in outer space

How can humans perceive sound?

• They can only hear it.
• They can only hear and see it.
• They can hear it and might also see or feel it.
• Humans cannot perceive sound.

CJ puts a ruler on the edge of a table, so that a few inches hang off. He hits the ruler and hears a noise. What else does CJ observe?

• The noise starts out low pitched and becomes high pitched.
• The part of the ruler he hit is moving back and forth.
• The part of the ruler he hit is completely still.
• The noise starts out soft but becomes louder.

4. How does sound energy travel?

• Sound energy travels in waves that need a solid, liquid or gas to carry them.
• Sound energy travels in waves that can move through the vacuum of empty space.
• Sound energy travels in a straight line in one direction.
• Sound energy travels in a straight line that switches directions periodically.

4. How does sound energy travel?

• Sound energy travels in waves that need a solid, liquid or gas to carry them.
• Sound energy travels in waves that can move through the vacuum of empty space.
• Sound energy travels in a straight line in one direction.
• Sound energy travels in a straight line that switches directions periodically.

What is a wave’s frequency?

• A. the width of a wave
• B. the rate at which a wave occurs
• C. the height of a wave
• D. the lowest point of a wave

6. A sound wave that occurs at a quick rate and has a high frequency would produce

• 6. A sound wave that occurs at a quick rate and has a high frequency would produce
• a low-pitched sound.
• a high-pitched sound.
• a soft sound

Which of the following is a measurement of a wave’s amplitude?

• the distance to the highest point of a wave
• the distance between waves
• the distance from which a sound can be detected
• the distance from which a sound can be detected

the distance from which a sound can be detected

• a loud sound
• a low-pitched sound
• a high-pitched sound.
• a soft sound.

While hiking a mountain, Gwen called out, “Yoohoo!” She then heard her own voice say, “Yoohoo. Yoohoo. Yoohoo.” What happened?

• The sound was completely absorbed by the mountain.
• The sound reflected back to Gwen as an echo.
• C. The sound was completely carried through the mountain away from Gwen.
• The sound didn’t travel as a wave at all.