Chapter #12 - Sound Flashcards
What makes sounds?
- Something vibrates
- Causes the air around it to vibrate
- Vibrations pass through air into our ears and cause eardrums to vibrate and we hear sound.
What type of wave is a sound wave?
A longitudinal wave
What does a sound wave consist of?
- Compression
- Rarefraction
What is the defenition of compresion?
A reagion of a sound wave wear the particles pushed together.
What is the defenition of rarefraction?
A region of a sound wave where particles are further apart.
What an essential factor that causes sound to travel?
A medium
Why can no sound be heard in a vacuum?
Becasue there are no particles presesnt to pass on the vibrations caused by the sound wave.
How fast does sound generally travel in air?
between 330 m/s - 350 m/s
How fast does sound generally travel in liquids?
1500 m/s
What factors cause the speed of sound to varey?
- Temperature
- Humidity
What is the trangle for speed?
What can help you see sound and how does it work?
What: A cathode ray oscilloscope and michrophone can be used to repersent sounds on a dispaly screen.
How: Michroscope picks up sound and converts it to an electrical signal, oscilloscope converts this to a line which represents the vibrations that make up the sound wave.
What is amplitude?
**
What does amplitude do to sound?
makes it louder or quieter
What is frequency?
What is the unit for frequency?
Hertz
What is one hertz?
1 wave per second
Why co people stop hearing as much as we grow older?
Because the sensory cells in our ears which detect vibrations deteriorate. These cells can also be damaged by repeated exposure to loud noise.
What is the equatiom for a wave?
velocity = frequency / wavelength
