# Questions tagged [terminology]

Use this for questions relating to the proper use of physics terminology or nomenclature.

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### What is the use of $g$-factor for magnetic moment of electron?

$g$-factor is also called the spectroscopic splitting factor according to "Introduction to Solid State Physics" by Charles Kittel. So it can be presumed that it is related to the splitting of levels ...
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### If velocity in forward and backward directions is positive and negative respectively, then what is it in left and right directions? [closed]

I have defined velocity in forward direction to be positive and negative in the backward direction. So what is the velocity if the body is moving right or left?
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### What is difference between periodic & oscillatory motions?

I read about two motions of objects Periodic motion & Oscillatory motion. Are they same motion? If not what is the basic difference between these two motions?
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### More appropriate statement for the SHM

I know that the energy of SHM is given by $$E=\frac 12 kA^2$$ So which of these is more appropriate to say? Energy is increases because amplitude is increased. Amplitude is increased because ...
### Why Pauli called the swap matrix $σ_x$? Why not $σ_y$?
Why Pauli called the following matrix $\:\sigma_x\:$ and not $\:\sigma_y$? \sigma_x\boldsymbol{=} \begin{bmatrix} 0 & 1 \vphantom{\tfrac{a}{b}}\\ 1 & 0 \vphantom{\tfrac{a}{b}}...