Waves

Learn about the history of telescopes and the function of refracting and reflecting optical telescopes.

Learn about radio astronomy, a type of astronomy that studies objects in space using radio waves and radio telescopes.

Learn about the history, function, uses, benefits and risks of Ultrasonography as a medical imaging technology.

Learn about telescopes, how they work & why they're important to astronomers.

Learn how sound travels in waves and how it is measured in this backgrounder.

Rainbows are beautiful examples of optics in nature. We see them thanks to the reflection and refraction of visible light and water.

A Canadian researcher built the first voltage-controlled synthesizer in the 1940s.

Learn about the different types of radiation, how they interact with atoms and how they can affect you.

Could we use radio waves to charge electrical technologies in the future?

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!

Using stethoscopes, doctors can use sound waves to detect various health issues. Learn how this device has evolved since it was invented in 1816!

What is the difference between sound and noise? How do they affect your hearing? And is noise always a bad thing?

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.

Try out this cool activity to hear sound vibrations.

Explore the concept of persistence of vision in this hands on activity.