1. When an electric field combines with an magnetic field, it forms an electromagnetic wave. Also, an electromagnetic wave does not need a medium to pass through.

2.  There are 7 different types of electromagnetic waves.  Radio Waves  Microwaves  Infra Red Waves  Visible Light Rays  Ultra Violet Waves  X-ray Waves  Gamma Rays

3.  Radio waves are mainly used for communications and in the electromagnetic spectrum they have the lowest frequencies.  Ex - An old FM/AM radio.  Ex – An antennae from a Television.  Pictures -

4.  Microwaves makes substances hot by causing water and fat molecules to vibrate.  Ex – A microwave  Ex – Mobile phones  Pictures -

5.  Infra red waves give off by heat.  Ex – Lamps  Ex – Security lights  Pictures -

6.  Visible light rays is anything hot enough to glow.  Ex - Light bulb  Ex - Cinema Projectors  Pictures -

7.  Ultra Violet waves are from special lamps.  Ex - Tanning bed  Ex - UV lamps  Pictures -

8.  X-ray waves pass through most substances.  Ex – Stars  Ex – X-ray machines  Pictures -

9.  Gamma rays carry large amounts of energy and are used to kill of cancer.  Ex – Radio therapy  Ex – Scintigram  Pictures -

10.  Mechanical waves needs a medium to pass through.  Ex – A flag waving in the air is a mechanical wave because the air passes through the flag.  Ex – A pond making waves after a rock has been thrown in has mechanical waves because the waves pass through water.  Pictures -