6.6.1.4 Sound Waves Flashcards
1
Q
What does sound waves travelling through solids cause?
A
- vibrations in the solid
2
Q
What happens within the ear because of sound waves?
A
- ear drum and other parts vibrate
- leads to sensation of sound
3
Q
What restricts the limits of human hearing?
A
- conversion of sound waves to vibrations of solids (work over a limited frequency range)
4
Q
What is the normal human hearing frequency range?
A
- 20Hz to 20000Hz
5
Q
How can sound waves that reach the ear drum cause it to vibrate?
A
- vibrations are passed onto ossicles, through semicircular canals and to cochlea
- cochlea turns vibrations into electrical signals which get sent to brain and allows sense of sound
6
Q
How is human hearing limited?
A
- size and shape of ear drums
- structure of other parts within the eat that vibrate to transfer energy
7
Q
Why can’t sound travel in space?
A
- space is a vacuum (no particles to move or vibrate)
8
Q
What does sound travel faster in?
A
- solids than liquid
- liquids than gases
9
Q
Why does sound travel in a solid rather than a liquid or liquid than a gas?
A
- more particles to vibrate
10
Q
What are vibrations from sound waves passed through medium as?
A
- compressions
- rarefactions
11
Q
How will sound waves be reflected?
A
- by hard surfaces
- e.g. echoes
12
Q
What happens when a sound wave enters a denser material?
A
- speed up
- due to a wave travelling into a different medium meaning its wavelength changes
