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Listed under:  Science  >  Matter  >  Atoms  >  Elementary particles  >  Photons
Video

How does the retina work?

When electrons in your retina absorb photons of light they don't emit light, they cause a molecule to change shape - and that lets you see colour!

Video

Can photons and atoms generate laser?

Electrons around atoms can absorb and emit photons of particular colours of light – see three different atomic models explain what's going on.

Video

Catalyst: Electromagnetic radiation

Do you know how radios transmit sound, or how ultraviolet light travels through the air? Listen to Bernie Hobbs explain electromagnetic radiation and discover what radios, ultraviolet light, x-rays and nuclear blasts have in common. Find out about their energy levels, how they travel from place to place, and at what speed, ...