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

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Can photons and atoms generate laser?

TLF-IDM019618

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

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How does the retina work?

TLF-IDM019617

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!

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Catalyst: Electromagnetic radiation

TLF-IDM015814

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, ...

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