Electro magnetic spectrum
- Created by: emilycooke15
- Created on: 03-11-18 09:26
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- Electro magnetic spectrum
- Goes from smallest to biggest in colours: Infared, Red, Orange, Yellow, Green, Blue, Indigo, Violet
- Red has the longest wavelength but the lowest freq but violet has the shortest wavelength, higher freq.
- Infared Waves: have a wavelength between 1 millimetre and 1 thousandth of a mm
- Emitted by warm or hot objects and reflected by shiny surfaces but absorbed by dark surfaces
- Radio Waves: sent out in all directions that are on at all masts on big hills
- Carry speech or music which is then detected and reproduced by radio sets in nearby areas
- Microwaves: are electro magnetic waves with a wavelength from a few mm to a meter
- Used to send information to satalites into space making possible instant communication around the world
- Can carry speech, music and pictures info and go straight through ionsphere which is a layer of electronically charged particles high in earths atmosphere
- Used to send information to satalites into space making possible instant communication around the world
- Visible Light waves: Stimlates the light sensitive cells on the retina of the human eye and makes human eyes work
- The wavelength is less than 1 thousandth of a millimetre.
- Ultraviolet waves: emitted by suns and lamps that are used in sun beds
- Can cause skin cancer and damage to human eyes
- Some chemicals are in hair dye and can absorb uv rays and re-emit them as visible light
- Can cause skin cancer and damage to human eyes
- Gamma Rays: wavelength is about 0.1 nanometers or less.
- They can pass through soft materials but harder materials absorb them eg bone
- `They can also be used to treat life threatening illnesses like cancer as they can be used to chemotherapy but can cause genetic mutation
- They can kill living bacteria and so are use to clean surgical equipment
- All travel at the speed of: 3 x 10 to the 8
- They can kill living bacteria and so are use to clean surgical equipment
- `They can also be used to treat life threatening illnesses like cancer as they can be used to chemotherapy but can cause genetic mutation
- They can pass through soft materials but harder materials absorb them eg bone
- Goes from smallest to biggest in colours: Infared, Red, Orange, Yellow, Green, Blue, Indigo, Violet
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