Final answer:
We use a square wave in a function generator for waveform analysis because it enables clear visualization of changes in amplitude and frequency, and according to Fourier's theorem, complex waveforms can be decomposed into sines and cosines, including square waves.
Step-by-step explanation:
We choose to use a square wave with the function generator because it allows for a clear and distinct analysis of how different frequencies and amplitudes affect the properties of the sound. Square waves are particularly useful because, according to Fourier's theorem, any complex waveform can be constructed from a combination of sine and cosine functions. The square wave's characteristics, such as its sudden transitions between high and low values, provide a rich set of harmonics when decomposed into its Fourier components.
When using a function generator connected to a speaker and a microphone connected to an oscilloscope, the square wave can be easily visualized, offering a clear representation of the changes in amplitude and frequency. With the function generator's ability to control these parameters, we can experiment to see the direct visual impact on the waveform displayed by the oscilloscope.