Sounds and Noises
The experiments are usually engaging and interesting for the students and they enjoy doing them. The topic can be an introduction to periodic and non-periodic phenomena and can help emphasizing the difference between periodic and harmonic signals.
This can also be a good introduction to geometrical progressions. Ratio between keys that differ of one semitone, is constant, as it can be detected from the following table:
The collected data can be the starting point for the study of sinusoidal functions and a non artificial way of introducing the concepts of period, frequency, amplitude and phase. Signals from tuning forks are a very good approximation of sinusoidal functions. This kind of mathematical modeling can be made very easily.
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