Properties of Sound
A vibration that can be heard
sound
How loud or soft a sound is
volume
The science of sound is called
acoustics
A sound wave that bounces back toward its source and is heard
echo
Sound moves the slowest through this state of matter
gas
Most of the sounds we hear travel through this form of matter.
the air
A slowly vibrating object has a low
pitch
A certain type of sound that is often thought of as harsh, unwanted or surprising is called
noise
A type of echolocation that locates items underwater is called
The number of sound waves that pass a point in one second
a wavelength
A disturbance that moves energy from place to place
a wave
The intensity of a sound is measured this unit
decibels
Surfaces that are smooth and hard usually ___________ sound. Materials that are rough, soft or fuzzy ____________ sound.
reflect / absorb
The study of this helped in the development of early ideas and theories about sound.
music
True or False: Particles of matter are carried along with a sound wave.
False -- Particles of matter are not carried along with a sound wave.
Because sound waves travel through matter, they are described as _______________ waves.
mechanical
The quality of a sound that distinguishes this
timbre
A sound wave gradually ____________ as its energy is used up.
fades
Vibrations of the vocal chords take place inside
the larynx / voice box
True or False: The part of a sound wave where the motion of each vibration pushes together some of the particles of the matter is called a compression.
True
wavelength, compression, rarefaction
The pitch of a sound is related to a sound's
frequency
Surfaces that are smooth and hard usually ___________ sound. Materials that are rough, soft or fuzzy ____________ sound.
reflect / absorb
True or False: Musical instruments that are played at the same pitch and volume still sound different because of their timbre.
True
True or False: A machine that changes sound waves into electrical pictures that are seen on a graph is called an ultrasound.
False -- oscilloscope