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Unformatted text preview: Lab 15: Standing Waves: Transverse and Longitudinal SAR Physics A M Kolchin I. Introduction When a wave hits a hard boundary it reflects back and in- terferes with its reflection. At certain frequencies, (called normal mode frequencies ) it will form a standing wave, with fixed nodes of complete destructive interference. In this lab, well observe transverse and longitudinal stand- ing waves and record the frequencies at which they appear. The standing waves will occur in ascending levels of har- monics as we go up in frequency.(The first standing wave is called the first harmonic, the second is called the second harmonic, etc.) II. Equipment 1. A diaphragm/speaker which can be driven at different frequencies. 2. A horizontal string attached to a post at one end and a pulley with a mass suspended at the other to control the tension (for the transverse wave). 3. A vertical spring attached at the top to a clamp and to the diaphragm at the bottom (for the longitudinal spring)....
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- Spring '08