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Question

Simple harmonic motion (SHM) is a technical term used to describe a certain kind of idealized oscillation. Practically all the oscillations that one can see directly in the natural world are much more complicated than SHM. Why then do physicists make such a big deal out of studying SHM?

A
It is the only kind of oscillation that can be described mathematically
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B
Any real oscillation can be analysed as a superposition (sum or integral) of SHMs with different frequencies
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C
Physics is concerned mainly with the unnatural world.
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D
Students are too stupid to appreciate the real world.
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Solution

The correct option is B Any real oscillation can be analysed as a superposition (sum or integral) of SHMs with different frequencies
Simple harmonic motion provides a basis for the characterization of more complicated motions through the techniques of Fourier analysis. Here any waveform can be represented as closely as desired by the combination of a sufficiently large number of sinusoidal waves that form a harmonic series. Fourier's theorem suggests that any periodic function can be represented as an algebraic sum of sine and cosine functions called a Fourier Series.

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