Emission spectra of hydrogen, helium and sodium with an unknown to identify

An example figure from the Line Spectrum generator.

Bright-line emission spectra of hydrogen, helium and sodium stacked on one 400–700 nm wavelength scale, with an unknown spectrum under them made of two of the three — Three bright-line emission spectra, hydrogen, helium and sodium, drawn as colored lines on black and stacked on one wavelength scale from 400 to 700 nm, so a line at the same wavelength sits at the same place in every strip. The fourth strip, labeled Unknown, is a mixture: it shows every line of hydrogen and of sodium, for students to match against the three above.

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Answer key

Hydrogen: 410.2, 434.0, 486.1, 656.3 nm
Helium: 447.1, 471.3, 492.2, 501.6, 587.6, 667.8 nm
Sodium: 568.8, 589.0, 589.6, 616.1 nm
Unknown: hydrogen and sodium

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