In the spectrum shown, which of the following peaks is NOT present? 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4000 3500 3000 2500 2000 1500 1000 500 wavenumber / cm1 С-Н OC=0 С-О O C=C O O-H Transmittance

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Q: negative absorbance,

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Q: Question attached

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.