# Science Unit 1

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• Created by: Charlotte
• Created on: 14-05-14 12:55
What is the amplitude of a wave?
it is the distance from the middle line to the top of the wave (crest)
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What is the wavelength?
the length of a full cycle of the wave (from crest to crest)
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What is the frequency?
the number of complete cycles or oscillations passing a certain point persecond.
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What is frequency measured in?
hertz (Hz). 1 Hz is 1 wave per second.
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How do waves travel?
Waves travel in straight lines through whatever substance they're travelling through. When the wave arrives at an obstacle or meets a new material, their direction change. This can happen by reflection, refraction or diffraction.
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What is reflection?
reflection of light allows us to see objects.When a beam of light reflects from an uneven surface, the light reflects off at different angles. If reflects on even surface, all the same angle.
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Law of reflection?/
Angle of INCIDENCE = Angle of REFLECTION.
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What is total internal reflection?
happens when the light ray travels through a dense material like glass towards a less dense substance like air. If the angle of incidence is big enough( bigger -critical angle), the ray doesn't come out at all, but reflects back into the material.
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## Other cards in this set

### Card 2

#### Front

What is the wavelength?

#### Back

the length of a full cycle of the wave (from crest to crest)

### Card 3

#### Front

What is the frequency?

### Card 4

#### Front

What is frequency measured in?

### Card 5

#### Front

How do waves travel?