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The wavelength (denoted by Greek letter Lambda) is the minimum distance between any two corresponding points on a wave that are in the same stage of the cycle. This distance is usually measured from peak to peak (crest to crest or trough to trough). Wavelength is a distance and is usually measured in meters.
The answer depends on the height of what? The method required for a person, a building, a mountain peak, a cloud would be different.
the peak
A wavelength of 254 nm is commonly used in UV detectors because it effectively targets the absorption peak of many organic compounds, particularly those containing aromatic rings. This wavelength is also optimal for detecting nucleic acids and proteins, as they exhibit strong absorbance at this range. Additionally, 254 nm is a standard wavelength for disinfection applications, making it useful in various analytical and industrial settings. Overall, its effectiveness in detecting a wide range of substances makes it a preferred choice in UV detection.
Non-Coincident Peak (NCP) is the individual or actual peak demands of each load in an electrical system oftentimes occurring at different hours of the day. It does not necessarily fall during system peak. (This is what i understood about NCP...I gladly welcome corrections)