Here’s a video that explains how the flame spectrometry lab works…..
Lab: for each sample, approximate the wavelength of emitted light by finding the corresponding color on this chart. Notice that the wavelengths are given in nanometers.
What is a nanometer?
Then calculate the energy of the emitted light using Plank’s formula;
E = hv = hc/Lambda
where h is Plank’s constant 1.67 x 10^-19 Joules and c is the speed of light 3.0 x 10^8 m/s.
Or use hc = 12,400 eV Angstroms.
Next find the energy levels of each sample element on the resource table and identify which electronic transition is accounting for most of the emitted light.