and also I do not recognize what this means. Is it a frequency? (considering that $lambda$ is generally supplied for frequency)

It is an ångström, a unit of size commonly provided in chemisattempt to meacertain points choose atomic radii and also bond lengths. Although not an official SI unit, it has a straightforward connection to the metric units of length:

$$1:mathrmångström = 1:mathrmÅ = 10^−10:mathrmm = 0.1:mathrmnm = 100:mathrmpm.$$

The angstrom was intended to be a tenth-metre, yet because the meaning being offered was even more exact than the metre at the moment, and based upon a mis-estimation of the Stockholm protoform, a various name is supplied. In a similar vein, the X-Unit is characterized as a thirteenth-metre, however likewise is out by some factor, so is not so referred to as.

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It was first supplied to measure spectral lines of the visible spectrum, however the size is convenient size for atoms and molecules. A hydrogen atom has a diameter of 1.058 A.

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What does the $Delta$ notation mean? E.g. for potential energy: $Delta U$ vs simply $U$? What is the difference?