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2.  Making Sound Waves:
 A sound wave begins with a vibration.
 How Sound Travels:
 Like other mechanical waves, sound waves carry energy
through a medium without moving the particles of the
medium along.

3.  Reflection:
 Sound waves may reflect when
they hit a surface
 Diffraction:
 Have you sound waves can also
diffract, bend around corners,
this is why you can hear someone
talking around the corner before
going around the corner.
 Interference:
 Sound waves may meet and interact
with each other.

4.  Elasticity:
 If you stretch a rubber band
and then let it go, it returns to its original shape,
however when you stretch modeling clay it stay
stretched elasticity is the ability of material
bouncing back after being disturbed.
 Density:
 Density is how much matter,
or mass there is in a given amount of space, or
volume
 Temperature:
 In a given medium,
sound travels more slowly at a lower temperature.
At a low temperature the particles of a medium more
move slowly then at a high temperature.

5.  Energy of a Sound Wave:
 in general the greater the energy used
 to make the sound the louder the sound.
 Distance From a Sound Source:
 loudness increases the closer you are
 to the sound source.
 Measuring Loudness:
 The loudness of different sounds is compared
 using a unit call the decibels (dB).

6.  Pitch and Frequency:
 Sounds with a high frequency have a high pitch,
sounds with a low frequency have a low pitch.
 Changing Pitch:
 Pitch is an important property off music because
music usually uses specific pitches called notes.

7.  What Causes The Doppler Effect:
 When a sound source moves the frequency
of the waves changes because the motion
of the source adds to the motion of the waves.
 What Causes Shock waves:
 When the plane travels almost as fast as the
speed of sound the sound barrier is broken

8.  Fundamental tones and overtones:
 You may recall that standing waves occur when
waves with just the right frequency interfere as they
reflect back and forth.
 Resonance:
 Resonance affects the sound
quality of a musical instrument by increasing the loudness
of certain overtones.

9.  Stringed Instruments:
 The guitar and violin are stringed
instruments.
 Wind Instruments:
 Wing instruments include brass instruments
Such as trumpets and woodwind instruments such
as clarinets.
 Percussion Instruments:
 Percussion instruments include drums bells
cymbals and xylophones.

10.  Acoustics is used in the design of correct
halls to reverberation and interference.

11.  Outer Ear:
 The outer part of you ear acts
as a funnel and collects sound.
 Middle Ear:
 Behind the ear drum is
the middle ear, the middle ear contain 3 of
the smallest bones in you body called the
hammer, the anvil, and stirrup.
 Inner Ear:
 A membrane separates the
middle ear form the inner ear the third
section of the ear.

12.  Causes of Hearing Loss:
 hearing loss can occur suddenly if the eardrum
is damaged or punctured
 Hearing Aid:
 For some types of hearing loss
the hearing aids can restore some ability to hear.

13.  Bats:
 Bats can use ultrasound waves with
frequencies up to 100,000 Hz to move
around and hunt.
 Dolphins, Porpoises, Whales:
 Dolphins, porpoises, and whales something have
to hunt in the darkness so like the bats they use
echolocation ultrasounds up to 150,00 Hz

14.  Sonar:
 A system that uses reflected sounds wave
to detect and locate objects
underwater is called sonar.
 Ultrasound Imagine:
 Doctors use ultrasound imaging to look inside
 the human body.

15.  Microphone: The microphone converts acoustic sound energy into
electrical energy. Some hearing aids use two microphones to help
separate background noise.
 Processor: The processor digitizes the acoustic sound, then separates
background noise from speech. Both are processed to make speech
clearer and to reduce the interference of background noise.
 Amplifier: The amplifier boosts the processed signal according to the
pattern and severity of your hearing loss, as well as the amount of
background noise.
 Speaker: The speaker converts the electrical signal back into acoustic
sound and directs the sound into your ear canal. Some models have the
speaker placed in your ear canal. Some use a tube that connects the
speaker to plug or custom ear mold. Others have the components
housed in a custom-fitting shell.
 Battery compartment: The battery powers the electronic components.
The battery compartment is used to turn the hearing aid on and off.
 Optional controls: Some models have a volume control to regulate the
volume. Others have a program control, enabling you to change the
processing for different listening situations, such as high background
noise or music. These controls are available on the hearing aids or on a
remote control.

16.  Sound quality is a blend tones.

17.  Ultrasound is used to look inside human bodies
like if a woman if pregnant you can see the baby
inside and all(: