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Oscilloscope and Frequencies

1. How can Lissajous patterns be used in checking out specific frequencies (such as in tuning a piano)?

2. What makes the sound of a violin different from that of a piano when they are playing the same note?

3. Can the wavelength of a signal be measured on an oscilloscope? Explain.

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This solution is provided in 712 words in both a .doc and .pdf file attached. It discusses sinusoidal signals and includes equations and diagrams to further understanding of the problem.