# Taransverse waves and Polarisation

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• Created by: apple87
• Created on: 05-04-15 13:13
What is a transverse wave?
When the vibrations are at right angles to the waves direction of travel.
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Give three examples of transverse waves
Electromagnetic, water ripples, waves on rope.
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What are the two main ways of drawing a transverse wave graph?
Displacement against distance or displacement against time.
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What is a longitudional wave?
The vibrations are along the waves direction of travel.
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Give an example of a longitudional wave.
Sound
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What is a polarised wave?
When a wave is passed though a vertiacal gap like a fence, the result is vertical waves becuase the gap fllters out vibrations in other directions.
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Electric and magnetic fields.
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What would have if light passed through two polarising filters at right angles to eachother.
No light would get through as all directions of vibration will be blocked.
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Can polaristion happen for longitudional waves?
No
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What happens when light is reflected?
The light becomes partially polarised.
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Why are the rods on a tv aerial horizontal?
The signal is polarised by by the oreintation of the rods which all have to be aligned.
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Whay do some communication satalights poleraise signals in the same frequency band?
To reduce interference between signals.
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When is polarisation used in nature?
Bees(and other insects) use polarised light to help them navigate and direct other bees.
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How do CD's use polarisation?
Use a polarising crystal to transmit light polarised in one direction and reflect ligh polarised in another direction.
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How do photographers and skiers use polarising lenses?
Remove unwanted relection in pictures and block glare of sunlight off the snow.
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## Other cards in this set

### Card 2

#### Front

Give three examples of transverse waves

#### Back

Electromagnetic, water ripples, waves on rope.

### Card 3

#### Front

What are the two main ways of drawing a transverse wave graph?

### Card 4

#### Front

What is a longitudional wave?

### Card 5

#### Front

Give an example of a longitudional wave.