Science Chapter 9 Test
Most of the sounds we hear travel through the _________________?
Air
How are singing and speaking similar?
Both are caused by vibrations of the vocal cords inside the larynx, or voice box.
How are an ear and a microphone similar?
Both receive sound vibrations and turn them into electrical messages.
The sound technician at a church is observing smooth curves on the oscilloscope screen while the choir is singing. Describe the kinds of sounds he is probably hearing.
Calm, Soft, Soothing
An ____________________ is a sound wave that bounces back toward its source and is heard?
Echo
A sound wave gradually ___________________ as its energy is used up?
Fades
The intensity of a sound is measured in WAVELENGTHS? T/F
False - Decibels is the correct answer
The number of sound waves that pass a point in one second is a WAVELENGTH? T/F
False - Frequency is the right answer
Sound moves the slowest through SOLIDS? T/F
False - Gases is the correct answer
The distance from one compression to the next is called a FREQUENCY? T/F
False - Wavelength is the right answer
Because sound waves travel through matter, they can be described as __________________ waves?
Mechanical
A certain type of sound that is often thought of as harsh, unwanted, or surprising is called ________________?
Noise
How high or low a sound is
Pitch
Label the PARTS of the diagram as COMPRESSION, RAREFACTION, or WAVELENGTH.......
SEE DIAGRAM
The matter through which a wave travels may be a ____________ and liquid or gas?
Solid
A type of echolocation that locates items underwater is called?
Sonar
A vibration that can be heard
Sound
The quality of a sound that distinguishes it
Timbre
A machine that changes sound waves into electrical pictures that are seen on a graph is called an OSCILLOSCOPE? T/F
True
In a sound wave that particles of the matter vibrate back and forth in the SAME DIRECTION that the sound energy is moving? T/F
True
Most of the SOUNDS WE HEAR are a blend of several waves, each with different characteristics? T/F
True
Musical instruments can play at the same pitch and volume, but they still sound different because of their TIMBRE? T/F
True
Particles of matter are not carried along with a SOUND WAVE? T/F
True
Sound waves travel in all directions AWAY from the source of the sound? T/F
True
______________________________ technology uses the echoes of high-frequency sound waves to "see" inside of a human body.
Ultrasound
A rapid back and forth movement
Vibration
How loud or soft a sound is
Volume
A disturbance that moves energy from place to place
Wave
The pitch of a sound is related to its ______________, or the number of waves in one second.
frequency
A QUICKLY vibrating object has a ___________ pitch?
high
Sound moves through ________________ in waves ?
matter
A SLOWLY vibrating object has a low _____________?
pitch
In a half hour, 5 cars passed over a bridge. In the next half hour, 12 cars passed over the bridge. All of the cars were traveling the speed limit. What changed - the speed, the matter, or the frequency of the cars?
the FREQUENCY
