P1D

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  • Created by: ellxe
  • Created on: 01-05-16 17:42
What is visible light made of?
A combination of waves of different frequency and wavelength (and so colours) that are out of phase with each other
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What makes a laser beam different?
All waves are the same wavelength and frequency, it is one single, pure colour. Waves are all in phase
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Do lasers have a low or high divergence?
Low. Unlike normal light it doesnt spread out as the distance increases
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What does the surface of a CD contain?
Billions of shallow pits. Between pits are called lands
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How does a CD work?
Laser is reflected from the shiny surface, reflection from land and pit is slightly different which can be changed into an electrical signal.
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What can infrared be used for in the home?
Cooking, remote controls, transmitting info between mobiles and computers (only short distances), security systems, instead of visible light
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What is infrared also known as?
Heat radiation
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What can infrared be used for due to it being given out by hot objects?
Monitor temperatures e.g. heat loss through a roof
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Other cards in this set

Card 2

Front

What makes a laser beam different?

Back

All waves are the same wavelength and frequency, it is one single, pure colour. Waves are all in phase

Card 3

Front

Do lasers have a low or high divergence?

Back

Preview of the front of card 3

Card 4

Front

What does the surface of a CD contain?

Back

Preview of the front of card 4

Card 5

Front

How does a CD work?

Back

Preview of the front of card 5
View more cards

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