They ask this on the exam in mass they only had a square box with a full wave with nothing Else in box; but on the bottom of the box which I couldn't read it was too small they had what looked like cm/.011 or something to that defect they ask at the half way point what was the number and then again ask another question asking other questions answers that jumped out at me which they had 4 was 10 and 5 So I picked 5 Didn't do anything like that in training so I don't know Thanks
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It is called a sine wave, rather than a sign wave.
Sign refers to whether a number is positive or negative.
Sine is the trigonometry function, that is the basis for the simplest of waveforms. Electrical power grids are based on Voltage being a sine wave function of time, that we call alternating current. Play with the function sin(x) on Wolfram Alpha to understand some properties about this function. Play with the general equation for a sine wave of y=A*sin(B*x + C) + D, to understand how adjusting A, B, C, and D affect the shape and position of its graph. Also play with its inverse function, called arcsin(x).
I also recommend familiarizing yourself with the angle unit "radian", since this unit is often the preferred angle unit for studying sine waves.
I cannot understand the rest of your question, but hopefully by knowing to look for this by the term "sine wave", it can help you know how to research it further.