Unit C: Electromagnetic Energy

The telegraph works by transmitting signals through an electrical circuit. Learn more and print your own telegraph key using this 3d model of a real artefact.

When astronomers search for extraterrestrial life, they often have to listen for radio waves coming from deep space. If you’re interested, you can help!

7 images of some objects that can reflect light such as mirrors, Mylar balloons and water

This backgrounder explains what light is, how it is measured, and how it affects people on Earth and astronauts on board the International Space Station.

How do magnetic fields help you get down safely from the top of a drop tower ride? Learn how electromagnetic induction works at the amusement park.

Scientists are training artificial intelligence to diagnose injuries using x-rays and other medical imagery of you (and millions of others). What improvements and other changes might this bring to the health care system?

How is light connected to the colours we see? In this STEAM activity make a colourful light catcher and discover why we see different colours?

How does the human eye see visible light as colour? And why do some people see more colours than others?

Gamma rays might make you think of cancer, harmful radiation or superheroes. But gamma rays have lots of uses: food safety, manufacturing and even medicine!

Learn how people came to understand the source of cosmic radiation, as well as how this radiation impacts those who work in and travel on airplanes.

The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.

Heavy metal is a term for some toxic chemical elements. They can cause problems like bioaccumulation, but are useful in nuclear medicine and medical imaging.