Properties of Sound
Sound waves are ___________ waves.
Longitudinal and mechanical
A system that uses the reflection of sound waves to find underwater objects is called....
Sonar
What part of your ear funnels sound towards the eardrum and ossicles?
Outer ear
_______ is the amount of energy that passes through a square meter of space in one second.
Intensity
The transfer of energy by a wave to the medium through which it travels is called... (hint, the air does this with sound waves traveling through it)
Absorption
What two factors affect the speed of sound?
The density and stiffness of the medium
The process animals like dolphins and bats use to locate objects using reflected sounds is called..
Echolocation
This part of your ear send messages to your brain to tell you that you're hearing.
Inner ear
The intensity or loudness of a sound is measured using what scale?
The Decibel Scale
The change of pitch when a sound source is moving in relation to an observer is the....
The Doppler Effect
Sound waves are created by __________ that spread out in all directions
Vibrations
Reflected waves are called _______ when a reflected sound waves is far away enough that it take longer than .1 of a second to return.
Echoes
Which part of your ear amplifies the sound?
Middle ear
_________ is an increase in amplitude that occurs when an object vibrating at its natural frequency absorbs energy from a nearby object vibrating at the same frequency.
Resonance
High frequency waves or __________ is often used for medical purposes.
Ultrasound
Where sound waves are pushed together they make ________ and when they spread out they form _____________.
Compressions and Rarefactions
When sound waves bounce off of an object, they are called..
Reflections
What part of your ear is the cochlea?
It's part of the inner ear
The study of how sound interacts with structures in a room is called
Acoustics
Which would produce more reverberations an empty room or one with furniture and why?
An empty room because there's nothing to absorb the sound.
If you are increasing the frequency of sound waves, you are also increasing what? And what sounds lower, high frequency sounds or lower?
Pitch, Lower
You will hear an echo if a reflected sound took ________ or more to return to your ears.
.10/second
Which part of your ear consists of the eardrum and ossicles?
Middle ear
The collection of reflected sounds from the surfaces in a closed space is called..
Reverberation
What are two ways that ultrasound is used for medical purposes?
To check on unborn babies, to treat muscle spasms and sprains, and to break up kidney stones