Solution for Graphing Spectra Student Worksheet,Part II
The graphical representation should include all visible lines shown in the color specrum. The continuum should rise gradually from 4000 angstroms, and remain fairly constant through blue, and decrease slightly in green portion of the spectrum. It should increase again, reach a maximum near yellow, and then decline again in the red.
Below are the solutions for the identifying the lines in the spectraof hydrogen and helium.
Hydrogen
We can identify three bright lines for hydrogen in the top spectrum.Measuring from the scale, the wavelengths are 435 nm (purple), 486 nm(blue) and 657 nm (red). Recall (e.g. from theCalculation Investigation) thatthe the frequency is given byn = c / l,and the energy is given byE = hn(where h = 6.626 x10-34J-s, and c = 3 x 108 m/s). In the tablebelow we summarize the frequency and energy results for these lines.(We include the color to aid in identifying the line in the spectrum.)
Helium
We can identify a number of lines in the spectrum of Helium.The bright lines are listed in the table below, along with theirfrequencies and energies. Students may identify any two of these.
