Lab preparation

During our next class, we will investigate the phenomenon of waves on a string - specifically, harmonics on a string.

You will be using the apparatus demonstrated in class.  It generates electronic sine waves which are sent to a vibrating device - the device vibrates at the frequency specified on the sine wave generator.

Your goal will be to determine how the frequency, wavelength, harmonic number (number of half-waves or "humps"), speed and (possibly) string tension (as determined by the weight on the string).

Here are things to think about prior to the lab:

1.  How does the frequency (or pitch) depend on the tension in the string?
2.  How can we generate "harmonics" on a string?
3.  Looking at a standing wave, how could we determine the wavelength of the wave on that string?
4.  What type of mathematical relationship(s) might exist between the variables above?
5.  Look at some applets that demonstrate standing waves or harmonics on a string.  I will post some shortly.