Pipe+lab

1. How did we determine the speed of a wave on a string? 2. What variables affect wave speed? 3. How can we determine the speed of sound? 4.Is it possible to measure its wavelength and frequency, and we can therefore measure the speed of sound. 5. What would be needed for a standing sound wave? 6. How can we tell if we have a good standing sound wave? 7. Loud = large amplitude as in standing waves on a string. When we did standing wave on a string, we kept length constant and adjusted frequency. With tuning forks, we have a constant frequency, so we adjust length (independent and dependent variables) 8. Will the length of the tube be the same as a wavelength? 9. What modes of vibration will there be for a medium fixed at one end and free at the other? 10. What factors will influence the resonance of the sound produced by the tuning fork? 11. How will the frequency (independent variable) be measured? 12. What will change as a result of changing the frequency? 13. How will you measure the dependent variable? 14. What controls are needed?
 * __PRE-LAB DISCUSSION:__**


 * Data**: Length of pipe at harmonic to frequency

Make second graph to straighten out the line.
 * Graph** - Frequency of fork (Hz) vs. Length of pipe (m)

1. What does the slope represent? 2. What it is the speed of? 3. Was this the speed of sound in the tube from lab 1? 4. How does the value from this lab compare to the speed of sound in air? 5. If the speed of sound in air is 345 m/s why did you get sonmething smaller? 6. What kind of boundaries do we have at the ends of the tube? 7. How can a graph could be produced that has a slope of 0.75v? ( Represent different standing waves in a tube open at one end. These representations are problematic because they use transverse waves to represent pressure waves. Make sure you are able to use this representation without the misconception that sound waves are transverse.)
 * __Questions :__**