top picks
Ultrasond and infrasound (BBC Bitesize)
Read all about ultrasound and infrasound and their uses. Then try the activity and do the test!

Making a telescope (Practical Physics)
How to do an experiment to make a telescope that works!

Amazing Space!
Choose one of the topics and learn more about telescopes, spectra, galaxies, comets and gravity. Get some help with your homework by selecting Homework Help on the left hand side.

Sound waves and interference of sound using interactive animations (PhET)
Run the simulation. This simulation lets you see sound waves. Adjust the frequency or volume and you can see and hear how the wave changes. Move the listener around and hear what she hears.

Echolocation (Kitchen Science)
Follow the instructions to use microphones and a laptop with Audacity to show how ultrasound scanning works.

Ray diagrams for plane mirrors
How to construct ray diagrams for plane mirrors

Step by step ray diagrams for convex lenses
How to construct a ray diagram step-by-step for converging lenses.

Geometric Optics Animation
Change the position of the object and look at what happens to the image. Work out what is happening using what you know about rays.

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 immune system
 blood cells
 biotechnology
 oils
 ray diagrams
 telescopes
 plane and spherical mirrors
 lenses
 sound and sonar
 ultrasound
 image
 the eye
 total internal reflection
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