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Emission spectrum of sodium

Emission spectrum of sodium

A150/0015

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Credit

PHYSICS DEPT., IMPERIAL COLLEGE / SCIENCE PHOTO LIBRARY PHYSICS DEPT., IMPERIAL COLLEGE / SCIENCE PHOTO LIBRARY

Caption

The photograph of the emission spectrum of sodium shows a single bright yellow line. In fact there are two emission lines, but they are so close together that the picture would have to be enlarged to a length of at least 2 metres before they became distinguishable. The yellow glow of sodium street lights is due to excited sodium atoms emitting light at this wavelength.

Release details

Model release not required. Property release not required.

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