Vocabulary
____ are made when an object moves back and forth very rapidly (vibrates)
Sound
The component that causes sound
Vibration
The faster the frequency of vibration in a sound, the HIGHER the pitch will be
True
Sound is a type of _________
Energy
List the 3 mediums sound travels through
Solid, Liquid, and Gas
the reflection of a sound
Echo
the study of how sound will travel around a room
Acoustics
False (slower)
Sound, light, and hear are all forms of ___________
Energy
List the 3 classifications of instruments discussed in the text
Percussion
Wind
String
The combination of the pitch, intensity, and quality of that sound
Tone
How high or low a sound is
Pitch
The louder the sound, the LESS energy used to create it.
False (More)
There is no sound in space because it is a ________
Vacuum - space with no matter
List how each of these instrument categories produce sound:
1) Percussion
2) Wind
3) String
1) Percussion - vibrating by being hit or shaken
2) Wind - vibrating a column of air inside a tube
3) String - vibrating string being plucked or stroked
The unit used to measure the intensity of a sound
Decibel
Hertz
Sound travels through gas the fastest
False (Solids)
Hard surfaces will ___________ sound energy
Reflect
List the two reasons we do not hear echoes all the time
If we are to close to the object
If the sound is absorbed by what it hits
The increase in amplitude of a systems natural frequency when the system is exposed to the same repeated vibrational force
Resonance
Any resonate frequency that is above or below the fundamental frequency giving sound sources their unique attributes
Overtones
Gregor Von Franklin was the first successful person to test that sound cannot travel through a vacuum
False (Otto Von Guericke)
Soft surfaces will _________ sound energy
absorb
List 2 task acoustical engineers work to accomplish
Reducing Sound
Increasing wanted sounds
Using sub and ultrasonic sounds