Properties of Sound
Waves-A
Waves-A
What is a rapid back-and-forth movement?
What type of matter do most sounds travel through?
air or gases
Do particles move with the sound wave, or do they just vibrate in place?
vibrate in place
What is how high or low a sound is?
pitch
What is the difference between a sound and noise?
What happens to a sound wave as its energy is used up?
Noise is usually unpleasant or unwanted sounds.
It fades away.
What is a vibration that is heard?
sound
What part of the inner ear do sound waves/vibrations change to electrical impulses?
cochlea
What is the distance from one compression to another?
wavelength
What determines whether a sound wave has a high frequency or low frequency?
the speed at which the object vibrates
What two things can happen when a sound wave hits an object or a surface?
What is a sound wave that bounces back toward its source and is heard?
the sound is reflected or absorbed
echo
What causes a vibration?
the movement of an object
What type of wave needs matter to move through?
mechanical
What sounds are below human hearing?
What sounds are above human hearing?
infrasonic
ultrasonic
How are frequency and pitch related?
low frequency-low pitch
high frequency-high pitch
Does a rough or smooth surface make a clearer echo?
What is the ability to "see" with sound?
a smooth surface
echolocation
How does sound move?
in waves
What part of a sound wave pushes the particles together?
compression
What machine changes mechanical sound waves into electrical pictures so scientists can study sound?
What type of matter do sound waves travel through the fastest?
oscilloscope
solids (particles are close together)
What is how loud or how soft sound is?
What changes the volume of a sound?
the amount of energy (intensity) used to make the sound waves
What animal uses echolocation?
What is man-made echolocation?
bats, dolphins, oilbirds
sonar
What is a disturbance that moves energy from place to place?
wave
What part of a wave is where the particles move away from each other?
rarefaction
What is the number of waves that pass a point in one second?
What unit is the number of waves measured in?
What direction do sound waves travel from the source?
frequency
hertz
in all directions
How is intensity measured?
At what point does the intensity of a sound begin to hurt human ears?
What is the quality of sound that distinguishes it from other sounds?
decibels
120 decibels
timbre
Name two things scientists can learn about underwater objects using sonar?
What technology uses sound waves to see inside the body?
What part of the human body is used to make vibrations for speaking or singing?
its distance, size, material, speed
ultrasounds
larynx