https://padlet.com/jquail770/nmdeiqgxhs6g en-us 2017-10-18 20:38:25 UTC 2026-01-04 11:38:33 UTC hello@padlet.com jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/198463456 > are transverse electromagnetic
> can travel through a vacuum
> travel at the same speed in a vacuum]]> 2017-10-18 21:06:44 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/198463456 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/198464063 > move energy from one place to another
> obey the wave equation (V=fλ)
> can be reflected and refracted]]> 2017-10-18 21:09:24 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/198464063 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/198466276 2017-10-18 21:19:37 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/198466276 sarahlilypreston https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205467584 ~Radio waves have the longest wave length in the EM spectrum
Uses
- Transmission of TV programmes and local radio programmes 
- Police and ambulance messages]]> 2017-11-09 19:28:22 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205467584 sarahlilypreston https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205474463 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]]> 2017-11-09 19:40:32 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205474463 sarahlilypreston https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205479433 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.]]> 2017-11-09 19:49:59 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205479433 sarahlilypreston https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205482646 Uses
-  Vision and photography 
- Optical fibre communication systems 
- Photosynthesis => light energy is converted to chemical energy
         ]]> 2017-11-09 19:56:14 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205482646 sarahlilypreston https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205483802 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

]]> 2017-11-09 19:58:47 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205483802 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205523650 2017-11-09 21:57:26 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205523650 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205525327 2017-11-09 22:05:02 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205525327 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205526691 2017-11-09 22:11:14 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205526691 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205527104 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]]> 2017-11-09 22:13:20 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205527104 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205528270 ~ 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]]> 2017-11-09 22:19:57 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205528270 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205530179 2017-11-09 22:28:38 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205530179 jquail770 https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205530637 2017-11-09 22:30:51 UTC https://padlet.com/jquail770/nmdeiqgxhs6g/wish/205530637