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Wavelength from a graph

For the hydrogen spectrum, how do you find the wavelength (experimental value in nm) from a graph? I don't understand what exactly you are plotting and how to get the wavelength from the graph. For example, if your scale readings are:

Violet-4.5, Blue-5.0, Yellow-6.0, Red-6.6

The same question applies to the spectra of cations when you have different solutions such as LiCl and your scale readings are:

Red-6.8, Yellow-6.1, Blue 4.6

How do you find these wavelengths from the graph?

Solution Preview

Dear student,
Spectrum means power vs wavelength(or frequency). To make the graph simpler the indexes on 10 (e.g., 4.5*10^(-7) m ) are not shown in the graph, and it is ...

Solution Summary

This solution explains scales in graphs and how to find wavelengths using listed scales.