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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.
Between 1 nanometre and 1 micrometre (= 1000 nm).
1.85 x 10^-1 nm
0.278 nm = 0.000278 µm
400 km = 4*1014 nm