1. In this problem, you are going to plot the sum of several sine waves, either in Origin
or in Excel (Excel will be more fun--more "interactive"). You can also do the
problem in something like Mathematica or Matlab. You will plot not just any sine
waves, but you do have some leeway.
 First decide whether you wish to do a spatial or a temporal frequency.
 Next choose that frequency.
 Generate a sinewave with amplitude 1.00 at the fundamental frequency.
 Generate a sinewave with amplitude 0.33 at the third harmonic (i.e., 3 x
fundamental)
 Generate a sinewave with amplitude 0.20 at the fifth harmonic.
 Generate additional sinewaves for the odd harmonics, decreasing the
amplitude in proportion to the harmonic as above. You can probably stop at
about 11th harmonic.
 Now ADD all the sinewaves and plot the sum.
 Does your answer look like Fig. 50-3 in The Feynmann Lectures?
 If not, how would you make it so?
For fun, visit this site: http://www.falstad.com/fourier/e-triangle.html
Or this one: http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/Freq/Freq4.html