Explain the production of continuous and characteristic spectra.

The figure below depicts spectral reflectance measurements for three different materials:  a green leaf from a healthy plant, a sheet of shiny blue paper, and the palm of a human hand.  The measurements are labeled 1 (black line), 2 (red line), and 3 (blue line).  Match the measurements to the most appropriate material type

Use the worked example above to help you solve this problem. A sodium surface is illuminated with light of wavelength 0.329 µm. The work function for sodium is 2.46 eV.

What is the origin of the splitting of spectral lines in a magnetic field?