# data[].attributes.body
> are transverse electromagnetic
> can travel through a vacuum
> travel at the same speed in a vacuum

# data[].attributes.body
> move energy from one place to another
> obey the wave equation (V=fλ)
> can be reflected and refracted

# data[].attributes.body
~Radio waves have the longest wave length in the EM spectrum
Uses
- Transmission of TV programmes and local radio programmes
- Police and ambulance messages

# data[].attributes.body
Uses
- Fast food cooking
how?
because the microwaves pass easily into the food  and are absorbed by the water molecules  which heat the food up
Dangers
Our bodies contain a lot of water molecules so if exposed to a large dose of microwaves our internal organs could be damaged as water in our cells is heated up

# data[].attributes.body
Uses
- To identify forgeries in bank notes
-UV rays are used for skin treatment in hospitals
Dangers
Too much exposure to UV radiation can cause skin cancer so is avoided by wearing sun cream

# data[].attributes.body
Uses
-  Vision and photography
- Optical fibre communication systems
- Photosynthesis => light energy is converted to chemical energy

# data[].attributes.body
~ Gamma rays have the shortest wavelength in the EM spectrum
Uses
- To kill cancerous growths (radiotherapy)
- To kill bacteria on fresh fruit and prolong its shelf life

# data[].attributes.body
All hot objects emit infrared, the higher the temperature of the object, the more I-R it emits
Uses :- Heating - toasters, grills and cookers
- Remote control for TV
- Burglar alarms
Dangers
Our bodies detect I-R because whenever it is absorbed, it produces heat, so too much I-R can result in burns.

# data[].attributes.body
Uses
- Medical diagnosis: x-ray photographs allow broken bones to be identified
Fact
The 'X' in 'x-ray' stands for 'unknown' just like an 'x' would be used in maths to indicate an unknown value