Electromagnetic waves 5.4 Microwaves and radio waves

Learning outcomes Be able to describe the properties of microwaves and radio waves Understand the uses and dangers of these waves

EM Radiation: Uses: Dangers: Microwaves Satellite communication, mobile phone networks, cooking, RADAR. Internal tissue heating.

How do microwaves cook food? Microwaves can be used in c_____ because many foods contain w____ molecules. Microwaves of the right w________ are able to make the water molecules r_______. This causes the food to get h____. ooking ater avelength esonate otter

EM Radiation: Uses: Dangers: Radio waves EM Radiation: Uses: Dangers: Radio waves Communication and astronomy.

Radio waves How do radio signals from the UK reach around the globe? The longer wavelength radio waves from a transmitter reflect off the Earth’s outer atmosphere (ionosphere).

Radio waves How can houses in the shadows of hills receive a radio signal? All electromagnetic radiation travels in straight lines, does it not? Radio waves diffract around the hill to the house. Remember diffraction?