Click on the letters and answer the questions - try to make it across the board!

Watch the animation on electromagnetic spectrum then do the quiz!

Watch the animation on the uses of radio and microwaves for communication, and digital and analogue signals.

Read all about the waves of the electromagnetic spectrum, uses and dangers. Then try the activity and do the test!

Read all about how we use X rays and gamma rays in hospitals to find and treat cancer, broken bones and more. Then do the test!

Run the simulation. Broadcast radio waves from KPhET. Wiggle the transmitter electron manually or have it oscillate automatically. Display the field as a curve or vectors. The strip chart shows the electron positions at the transmitter and at the receiver.

A video showing how you can show that your mobile phone uses microwaves.