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Vocabulary
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Lesson 2
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100
This describes how high or low a sound is.
Pitch
100
What is one way that sounds are alike? One way they are different?
Alike - All sounds are made when matter moves. Different - They can be loud or soft. Sounds can be pleasant or bother you.
100
How does sound travel?
Sound travels as waves through matter.
100
Hitting a tambourine with less force will make the sound... softer? louder? higher in pitch? higher in vibration?
Softer
100
The same sound travels through air, water, milk, and steel. Through which matter will the sound travel most quickly?
Steel (Sound travels most quickly through solids.)
200
This is a back-and-forth movement.
Vibration
200
How is sound made?
Sound is made when matter vibrates, or moves back and forth quickly.
200
Why does sound travel quickest through solids?
Sound travels fastest through solids because the particles are closest together.
200
How do wind instruments make sound?
Air inside them vibrates?
200
How is the length of a sound wave measured?
From the center of one compression wave to the center of the next compression wave (wavelength).
300
This is a movement of particles that makes a kind of wave.
Compression wave
300
How are the sound produced by different strings of a harp alike? How are they different?
Alike - The sounds are all caused by vibrations. Different - They are different depending on how long or short the strings are. Short strings have a higher pitch. Long strings have a lower pitch.
300
How do some insects make sounds?
Bees and mosquitoes make buzzing sounds when they vibrate the air with their wings; katydids make chirping sounds by rubbing their wings together.
300
Which part of the ear has a shell-shaped part filled with liquid?
The inner ear
300
True or False? An object that vibrates more quickly has a lower pitch.
False. An object that vibrates more quickly has a higher pitch than an object that vibrates more slowly.
400
Name the four parts of the ear that help you hear.
Outer ear, eardrum, little bones, and inner ear
400
What makes vocal cords vibrate?
Vocal cords vibrate when air passes between them.
400
What path do sound waves follow through the ear?
Sound waves enter the outer part of the ear, and travel to the eardrum, to bones in the ear, and to hairs in the liquid in the inner ear. The signal then goes to the nerves and finally to the brain.
400
Why does sound usually travel most slowly through gases? (p. 398)
The particles in gases are farther apart than the particles in liquids and solids.
400
Sound travels in waves. How are the speeds at which sound waves travel as they go through air, water, and solids different?
Sound waves usually travel most quickly through solids and most slowly through air. The particles in air are farther apart than particles in solids. Therefore, since sound waves travel through particles, it takes them longer to travel through air than it does for them to travel through a solid.