A periodic wave done using a rope is for example a sine wave.
It is the form of Simple Harmonic Motion, and traces the equation y = sin(x) where y=1 and -1 are the peaks.
sine wave
Fourier analysis shows that the saw wave is constructed through manipulation of a sine wave, I can't remember the maths behind it but it's definitely a sine wave.
By shifting the sine wave by 45 degrees.
Sine wave
A sine wave is the graph of y = sin(x). It demonstrates to cyclic nature of the sine function.
The voice is not a sine wave.
a phase shifted sine wave of a different amplitude.
cos wave
A sine wave has no harmonics. It only has a fundamental, so the value of the 2nd, 3rd, and 12th harmonics of a sine wave is zero.
It's called a sine wave because the waveform can be reproduced as a graph of the sine or cosine functions sin(x) or cos (x).
The sine wave, with its repeating pattern, can represent a single frequency with no harmonics.
All sine waves both sound and electromagnetic.