Show:
Intro
Properties
Speed
Loudness
Ear
100
What is the difference between light waves and sound waves?
Sound waves travel through a medium.
100
A sound wave is described by its _______, ______, _______, and _____.
wavelength, frequency, amplitude, speed
100
What affects the speed of sound?
type of medium and temperature
100
When sound waves move farther from its source what happens?
more particles collide
100
The human ear has how many parts?
3
200
Sound waves are ______ vibrations.
audible
200
The wavelength of a wave gets shorter as the wave's frequency ______.
increases
200
What takes longer to transfer sound energy? A) Liquids B) Gas C) Solids
B) Gas
200
What unit measures sound?
Decibel (dB)
200
What is in the inner ear and what does it do?
The COCHLEA changes the sound waves to nerve signals.
300
True or false. Humans hear sound waves between 10 Hz and 4,000 Hz.
False. 20 Hz and 20,000 Hz
300
The perception of how high or low a sound seems is called a _____.
pitch
300
The particles move faster and collide more often when.......
the temperature of a gas increases
300
Each increase of 10 dB results in a sound about _____ as loud.
twice
300
The middle ear does what?
amplifies or intensifies the sound waves
400
How do sound waves change pressure?
By causing air particles to move toward and then away from each other.
400
A female has a ______ range of frequencies.
higher
400
As liquids and solids cool, the molecules move ______ _______.
closer together
400
What decibel level is the danger zone?
80-140
400
The middle ear includes what?
the eardrum and three tiny bones: the hammer, the anvil, and the stirrup
500
What is the difference between compression and rarefaction?
Compression - particles of the medium are closest together Rarefaction - particles are farthest apart
500
The more energy used to produce a sound wave, the greater the ________.
amplitude
500
What is the speed of ice?
3,500 (m/s)
500
What decibel level is used in a library?
40
500
What does the brain process to create the perception of sound?
nerve signals