Electromagnetic Waves

1. Electromagnetic Waves 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. Wave Types • 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 • 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 • Microwaves makes substances hot by causing water and fat molecules to vibrate. • Ex – A microwave • Ex – Mobile phones • Pictures -

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

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

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

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

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

10. Mechanical Wave • 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 -