P1A Topic 2

James Disley
Mind Map by James Disley, updated more than 1 year ago
James Disley
Created by James Disley about 5 years ago
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Mind Map on P1A Topic 2, created by James Disley on 02/15/2015.

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P1A Topic 2
1 Electromagnetic waves Increases Frequency from left to right meaning the wavelength decreases.
1.1 Radio waves
1.1.1 Broadcast tv and radio.
1.2 Microwaves
1.2.1 Satellite communication
1.2.2 Cook food (different wavelength)
1.3 Infrared
1.3.1 Use to monitor temperature (night-vision equipment)
1.3.2 Optical fibres transmit data.
1.3.3 Used in toaster, remote controls and security system
1.4 Visible light
1.4.1 Too see
1.5 Ultra violet
1.5.1 Used to detect forged banknotes (displays fluorescent markings)
1.6 X-rays
1.6.1 Look inside objects
1.6.1.1 X-rays pass through flesh.
1.6.1.2 X-rays absorbed by bone.
1.7 Gamma waves
1.7.1 Treat cancer
1.7.2 Sterilisation of food and surgical instruments.
1.8 The higher the frequency the more damage it can do. Ex micro = heat body cells, Infra= Skin burns, ultra=skin cancer, Gamma= cell mutation.
2 Herschel
2.1 Discovered infared (1800)
2.2 Diffracted white light into the colour spectrum using a prism.
2.3 Measured each colour using a thermometer.
2.4 Temperature increased from violet to red
2.5 Beyond red he found the highest temperature.
3 Ritter
3.1 Discovered ultraviolet (1801)
3.2 Diffracted white light into the colour spectrum using a prism.
3.3 Measured each colour with silver chloride coated strips.
3.3.1 Silver chloride when exposed to light turns black from white.
3.3.1.1 Time how long it takes to change.
3.4 The blue end changed quicker then the red end.
3.5 Placed one beyond violet quickest change occurred.
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