AQA Physics Unit 1 - Communications

AQA Physics Unit 1 - Communications

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  • Created by: PhilMoze
  • Created on: 15-01-11 23:11

Electromagnetic Spectrum

(http://www.kollewin.com/EX/09-15-03/electromagnetic-spectrum.jpg)

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Uses

Radio - Tranmission

Microwaves - Cooking, Satellite

Infra Red- Optical Fibre's

Visible Light - Communication, Seeing

Ultraviolet Rays - Sunbeds

x-rays - Seeing broken bones

Gamma Rays - Killing cancer, sterilisation 

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Effects

Radio - Increases Body Temp

Microwaves - Burns

Infra Red- Burns

Visible Light - Damage Eyes

Ultraviolet Rays - Damage Eyes, cause cancer

x-rays - cancer

Gamma Rays - causes cancer

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Optical Fibre's

VISIBLE LIGHT AND INFA RED USED.

TOTAL INTERNAL REFLECTION

MORE INFORMATION SENT AND QUICKER, LESS WEAKENING OF SIGNAL(http://www.pacificcable.com/images/Fiber-Optic-Diagram.png)

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Analogue

ANY VALUE

INTERFERENCE LIKELY

WEAKEN OVER DISTANCE

(http://www.fmrib.ox.ac.uk/~iain/images/analogue.png) 

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Digital

ON OR OFF VALUES

INTERFERENCE HAS LESS EFFECT (STILL HAS EFFECT!)

DOESN'T WEAKEN SIGNAL

EASIER PROCESSED BY COMPUTER

(http://www.alltechn.com/wp-content/images/2009/06/digital-signal1.gif)

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