The reason for the 30% more absorption for a solution containing 50% ethanol than the solution containing no ethanol needs to be explained, if both the solution contains the same amount of nickel.
Spectral lines are lines which help identify atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
In a defined space, the amount of a substance gives its concentration. The capacity of a substance to absorb a specific wavelength of light gives its absorbance.
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