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Light & Sound
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Sound
A form of energy that is caused by vibrations that therefore needs something to travel through. It cant travel through a vacuum
Sound Waves
Layers of particles vibrating in turn passing sound energy through the air in rarefractions(spread out) and compressions(compressed together)
Frequency
The speed of the vibrations is called the frequency and is measured in herts(H
3
). 1 H
3
=1 vibration per second
Musical note A has a frequency of 440 H
3
Light Waves
Light waves can travel through empty space and therefore dont need a medium to travel through
Travels best through a vaccum
Travels at the speed of 300 000 km per second
Transparent
If light can travel through the substance clearly it is transparent e.g. glass and diamond
Translusent
If light is scattered as it passes through the substance it is translusent e.g. tissue paper and shower screen
Opaque
If light is blocked and cannot travel through the substance it is opaque e.g. wood and rock
Author
_Dani_
ID
175203
Card Set
Light & Sound
Description
Light and Sound
Updated
10/3/2012, 6:12:26 AM
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